Just wanted to give a bit of feedback - against Reapers I noticed that they don't try to get into close range to bite, they just run around at the edge of vision and do nothing unless there's a target really close by.
Maybe a special AI routine for melee units would work?
Wouldn't have to be advanced, as a Reaper is just a big berserk terror monster anyway, so it would seem credible that it would just run mindlessly at any target at top speed to bite..
I'm using the latest build by the way.
EDIT: just realized that this should probably have gone in the "suggestions" subforum, and that probably you are already are of this issue with Reapers