diff --git a/config/training/dqn-hyperopt.toml b/config/training/dqn-hyperopt.toml
index 8cb38f028..eb76c34ba 100644
--- a/config/training/dqn-hyperopt.toml
+++ b/config/training/dqn-hyperopt.toml
@@ -110,6 +110,8 @@ initial_capital = 100000.0
 ioc_fill_prob = 0.85
 limit_fill_min = 0.30
 limit_fill_max = 0.80
+tx_cost_multiplier = 0.18  # IBKR ES: 0.18 bps = $4.50/contract RT
+min_hold_bars = 10  # ~26s hold at 23 volume bars/min
 spread_cost_frac = 0.50
 spread_capture_frac = 0.50
 
diff --git a/config/training/dqn-localdev.toml b/config/training/dqn-localdev.toml
index 8b813d221..de6b43feb 100644
--- a/config/training/dqn-localdev.toml
+++ b/config/training/dqn-localdev.toml
@@ -46,12 +46,13 @@ min_epochs_before_stopping = 80
 [experience]
 gpu_timesteps_per_episode = 200
 gpu_n_episodes = 128
-min_hold_bars = 3
+min_hold_bars = 10  # ~26s hold at 23 volume bars/min
 
 [experience.fill_simulation]
 ioc_fill_prob = 0.85
 limit_fill_min = 0.30
 limit_fill_max = 0.80
+tx_cost_multiplier = 0.18  # IBKR ES: 0.18 bps = $4.50/contract RT
 spread_cost_frac = 0.50
 spread_capture_frac = 0.50