Hello, it seems like whirlwind is too strong. They will most likely shredding any light unit into pieces before they even had a chance to strike. I suggest that there will be an indicator on an area that whirlwind is going to barrage-d it. Take a look at manticore in DoW2, where there is red indicator which showed you that the barrage is incoming in that location/position. With this, opponent will have a time to avoid the incoming barrage where it usually decimate the whole army into oblivion.