terrain difficulties

Please move if this is in the wrong section.

Basically, my map has a custom model in it, where there's a castle ledge, and units can go on/off it and attack ranged, etc. However, I noticed that they "miss" a lot when they're attacking "higher" terrained units. I guess Warcraft III calculates this because the units are just "in" another unit, so they aren't higher than the other units.

Is there anyway I can adjust this? Thanks for any help

Go to Gameplay Constants and adjust "Combat - Chance to miss (moving or high ground)" for to be 0.

Then create your own system for missing attacks on higher ground which considers units on top of destructables.