diff --git a/src/frostfs_testlib/load/load_config.py b/src/frostfs_testlib/load/load_config.py
index 3a7e0b4..9023f87 100644
--- a/src/frostfs_testlib/load/load_config.py
+++ b/src/frostfs_testlib/load/load_config.py
@@ -271,6 +271,16 @@ class LoadParams:
 
         return env_vars
 
+    def __post_init__(self):
+        default_scenario_map = {
+            LoadType.gRPC: LoadScenario.gRPC,
+            LoadType.HTTP: LoadScenario.HTTP,
+            LoadType.S3: LoadScenario.S3,
+        }
+
+        if self.scenario is None:
+            self.scenario = default_scenario_map[self.load_type]
+
     def get_preset_arguments(self):
         command_args = [
             self._get_preset_argument(meta_field)
@@ -324,7 +334,7 @@ class LoadParams:
         # TODO: migrate load_params defaults to testlib
         if self.object_size is not None:
             size, unit = calc_unit(self.object_size, 1)
-            static_params = [f"{load_type_str} ({size:.4g} {unit})"]
+            static_params = [f"{load_type_str} {size:.4g} {unit}"]
         else:
             static_params = [f"{load_type_str}"]
 
@@ -335,7 +345,7 @@ class LoadParams:
         ]
         params = ", ".join(static_params + dynamic_params)
 
-        return f"load: {params}"
+        return params
 
     def __repr__(self) -> str:
         return self.__str__()