[Mobhack]

Well, as suggsted - if you are a slow" player then simply extending time available may well do it for you- in either or both of maneuvering to the approach and also in preparing the contact line with your arty assets. If your mortars are getting depleted in ammo wih these extra turns - then try adding a few ammo carriers perhaps.

Another thought might be to reduce visibility a bit so you are onto the defenders with less fire recieved?.

Also with regard to your arty preparation - deliberately use a few (60mm say) mortars deeper into the enemy predicted formation as "what the british termed "pepperpot" fires - to keep retiring troops heads down and encourage them to run away. Move the pepper dispensers about as its suppression not killing you want. US 60mm has a useful range, ~2km, not the 1000m of some WW2 50mm's. Useful to bring forward on a truck, unload some bombs and get clear before return fires fall onto them.

Welcome to the art of scenario editing!