diff --git a/python/sglang/srt/mem_cache/unified_radix_cache.py b/python/sglang/srt/mem_cache/unified_radix_cache.py
index 5b0c56a84..71e0158a1 100644
--- a/python/sglang/srt/mem_cache/unified_radix_cache.py
+++ b/python/sglang/srt/mem_cache/unified_radix_cache.py
@@ -1244,12 +1244,6 @@ class UnifiedRadixCache(BasePrefixCache):
                 self.dec_lock_ref(ancestor_node)
                 return None
 
-        logger.info(
-            "load_back: kv_tokens=%d, node_id=%d",
-            kv_tokens,
-            last_hit_node.id,
-        )
-
         # Load H→D
         aux_xfers = [x for xfers in comp_xfers.values() for x in xfers]
         aux_xfers.extend(anchor_kv_shared_indices_xfers)
@@ -1367,14 +1361,9 @@ class UnifiedRadixCache(BasePrefixCache):
         req = params.req
 
         if last_node.evicted or params.host_hit_length > 0:
-            logger.info(
-                "init_load_back triggered: node_id=%d, host_hit_length=%d",
-                last_node.id,
-                params.host_hit_length,
-            )
             loading_values = self.load_back(last_node, mem_quota, req=req)
             if loading_values is not None:
-                logger.info(
+                logger.debug(
                     "init_load_back success: loaded %d tokens for node %d",
                     len(loading_values),
                     last_node.id,
diff --git a/python/sglang/test/kl_test_utils.py b/python/sglang/test/kl_test_utils.py
index b3c90caae..de77fb7af 100644
--- a/python/sglang/test/kl_test_utils.py
+++ b/python/sglang/test/kl_test_utils.py
@@ -118,8 +118,13 @@ def compare_kl_divergence(
 
 
 # Common request helpers
-def _flush_cache(base_url):
-    requests.post(base_url + "/flush_cache")
+def _flush_cache(base_url, timeout_s=30):
+    response = requests.post(
+        base_url + "/flush_cache",
+        params={"timeout": timeout_s},
+        timeout=timeout_s + 10,
+    )
+    response.raise_for_status()
 
 
 def _generate(
diff --git a/test/registered/radix_cache/test_unified_radix_cache_kl.py b/test/registered/radix_cache/test_unified_radix_cache_kl.py
index 0543bd5c7..3a58858c4 100644
--- a/test/registered/radix_cache/test_unified_radix_cache_kl.py
+++ b/test/registered/radix_cache/test_unified_radix_cache_kl.py
@@ -34,7 +34,7 @@ MAMBA_TRACK_INTERVAL = 128
 SWA_MODEL = "openai/gpt-oss-20b"
 FULL_MODEL = "Qwen/Qwen3-32B"
 
-register_cuda_ci(est_time=632, suite="stage-c-test-4-gpu-h100")
+register_cuda_ci(est_time=760, suite="stage-c-test-4-gpu-h100")
 
 
 class UnifiedRadixTreeTestMixin:
@@ -235,8 +235,8 @@ class TestUnifiedSWARadixCache(UnifiedRadixTreeTestMixin, CustomTestCase):
     """SWA hybrid + UnifiedRadixCache."""
 
     kl_threshold = 0.03
-    gsm8k_threshold = 0.75
-    mmlu_threshold = 0.75
+    gsm8k_threshold = 0.7
+    mmlu_threshold = 0.7
 
     @classmethod
     def setUpClass(cls):
@@ -253,7 +253,7 @@ class TestUnifiedSWARadixCache(UnifiedRadixTreeTestMixin, CustomTestCase):
                 "0.7",
                 "--disable-piecewise-cuda-graph",
             ],
-            env={"SGLANG_ENABLE_UNIFIED_RADIX_TREE": "0"},
+            env={"SGLANG_ENABLE_UNIFIED_RADIX_TREE": "1"},
         )
         cls.input_ids = get_input_ids(cls.model, num_samples=18)
 
@@ -262,54 +262,57 @@ class TestUnifiedSWARadixCache(UnifiedRadixTreeTestMixin, CustomTestCase):
         kill_process_tree(cls.process.pid)
 
 
-# TODO(hzh): Currently, HiCache is not fully compatible with the CI CUDA13 environment; we need to wait for the fix before re-enabling the tests below.
-# class TestUnifiedMambaRadixCacheWithHiCache(UnifiedRadixTreeTestMixin, CustomTestCase):
-#     """Mamba hybrid + UnifiedRadixCache."""
-#
-#     kl_threshold = 0.003
-#     prefill_cache_assert = staticmethod(
-#         make_mamba_prefill_assert(chunk_size=MAMBA_CHUNK_SIZE)
-#     )
-#     decode_cache_assert = staticmethod(
-#         make_mamba_decode_assert(track_interval=MAMBA_TRACK_INTERVAL)
-#     )
-#
-#     @classmethod
-#     def setUpClass(cls):
-#         cls.model = MAMBA_MODEL
-#         cls.base_url = DEFAULT_URL_FOR_TEST
-#         cls.process = popen_launch_server(
-#             cls.model,
-#             cls.base_url,
-#             timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
-#             other_args=[
-#                 "--tp-size",
-#                 "4",
-#                 "--chunked-prefill-size",
-#                 "2048",
-#                 "--mem-fraction-static",
-#                 "0.85",
-#                 "--mamba-scheduler-strategy",
-#                 "extra_buffer",
-#                 "--mamba-track-interval",
-#                 str(MAMBA_TRACK_INTERVAL),
-#                 "--enable-hierarchical-cache",
-#                 "--hicache-ratio",
-#                 "1.5",
-#                 "--hicache-write-policy",
-#                 "write_through",
-#                 "--hicache-io-backend",
-#                 "direct",
-#                 "--hicache-mem-layout",
-#                 "page_first_direct",
-#             ],
-#             env={"SGLANG_ENABLE_UNIFIED_RADIX_TREE": "1"},
-#         )
-#         cls.input_ids = get_input_ids(cls.model, num_samples=18)
-#
-#     @classmethod
-#     def tearDownClass(cls):
-#         kill_process_tree(cls.process.pid)
+class TestUnifiedMambaRadixCacheWithHiCache(UnifiedRadixTreeTestMixin, CustomTestCase):
+    """Mamba hybrid + HiCache + UnifiedRadixCache."""
+
+    kl_threshold = 0.003
+    prefill_cache_assert = staticmethod(
+        make_mamba_prefill_assert(chunk_size=MAMBA_CHUNK_SIZE)
+    )
+    decode_cache_assert = staticmethod(
+        make_mamba_decode_assert(track_interval=MAMBA_TRACK_INTERVAL)
+    )
+
+    @classmethod
+    def setUpClass(cls):
+        cls.model = MAMBA_MODEL
+        cls.base_url = DEFAULT_URL_FOR_TEST
+        cls.process = popen_launch_server(
+            cls.model,
+            cls.base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            other_args=[
+                "--tp-size",
+                "4",
+                "--chunked-prefill-size",
+                "2048",
+                "--mem-fraction-static",
+                "0.85",
+                "--mamba-scheduler-strategy",
+                "extra_buffer",
+                "--mamba-track-interval",
+                str(MAMBA_TRACK_INTERVAL),
+                "--enable-hierarchical-cache",
+                "--hicache-ratio",
+                "4",
+                "--hicache-write-policy",
+                "write_through",
+                "--hicache-io-backend",
+                "direct",
+                "--hicache-mem-layout",
+                "page_first_direct",
+                "--max-total-tokens",
+                "12000",
+                "--max-running-requests",
+                "4",
+            ],
+            env={"SGLANG_ENABLE_UNIFIED_RADIX_TREE": "1"},
+        )
+        cls.input_ids = get_input_ids(cls.model, num_samples=18)
+
+    @classmethod
+    def tearDownClass(cls):
+        kill_process_tree(cls.process.pid)
 
 
 if __name__ == "__main__":