diff --git a/projects/hip-tests/catch/unit/cooperativeGrps/coalesced_group.cc b/projects/hip-tests/catch/unit/cooperativeGrps/coalesced_group.cc
index 48c84191ca..93101d8e9c 100644
--- a/projects/hip-tests/catch/unit/cooperativeGrps/coalesced_group.cc
+++ b/projects/hip-tests/catch/unit/cooperativeGrps/coalesced_group.cc
@@ -421,7 +421,9 @@ template <typename T> void CoalescedGroupShflUpTestImpl() {
   INFO("Coalesced group mask: " << active_mask);
   unsigned int active_thread_count = get_active_thread_count(active_mask, warp_size);
 
-  auto delta = GENERATE(range(static_cast<size_t>(0), static_cast<size_t>(getWarpSize())));
+  // Tests edge cases (0, 1, max-1) and middle values
+  auto delta = GENERATE(values<size_t>({0, 1, static_cast<size_t>(getWarpSize()/2),
+                                         static_cast<size_t>(getWarpSize()-1)}));
   delta = delta % active_thread_count;
   INFO("Delta: " << delta);
   CPUGrid grid(blocks, threads);
@@ -501,7 +503,9 @@ template <typename T> void CoalescedGroupShflDownTest() {
   INFO("Coalesced group mask: " << active_mask);
   unsigned int active_thread_count = get_active_thread_count(active_mask, warp_size);
 
-  auto delta = GENERATE(range(static_cast<size_t>(0), static_cast<size_t>(getWarpSize())));
+  // Tests edge cases (0, 1, max-1) and middle values
+  auto delta = GENERATE(values<size_t>({0, 1, static_cast<size_t>(getWarpSize()/2),
+                                         static_cast<size_t>(getWarpSize()-1)}));
   delta = delta % active_thread_count;
   INFO("Delta: " << delta);
   CPUGrid grid(blocks, threads);
diff --git a/projects/hip-tests/catch/unit/memory/hipHostAlloc.cc b/projects/hip-tests/catch/unit/memory/hipHostAlloc.cc
index 55d53f3d08..6882b55cfc 100644
--- a/projects/hip-tests/catch/unit/memory/hipHostAlloc.cc
+++ b/projects/hip-tests/catch/unit/memory/hipHostAlloc.cc
@@ -28,7 +28,7 @@ THE SOFTWARE.
 #include <hip_test_helper.hh>
 #include <kernels.hh>
 
-#define MEMORY_PERCENT 10
+#define MEMORY_PERCENT 5
 #define BLOCK_SIZE 512
 #define VALUE 32
 
diff --git a/projects/hip-tests/catch/unit/memory/hipHostMalloc.cc b/projects/hip-tests/catch/unit/memory/hipHostMalloc.cc
index 8b9e9318d6..3bc1f0c20b 100644
--- a/projects/hip-tests/catch/unit/memory/hipHostMalloc.cc
+++ b/projects/hip-tests/catch/unit/memory/hipHostMalloc.cc
@@ -38,7 +38,7 @@ This testfile verifies the following scenarios of hipHostMalloc API
 #define SYNC_EVENT 0
 #define SYNC_STREAM 1
 #define SYNC_DEVICE 2
-#define MEMORY_PERCENT 10
+#define MEMORY_PERCENT 5
 #define BLOCK_SIZE 512
 #define VALUE 32