The penalty for land gains for expanded conquests is way, way too steep.
As an example for those who haven't used it yet, against a 130% sized prov a conquest yielded a whopping 26 acres.
50 would have been lame enough, 35 or 40 quite depressing, but 26?!?
This is enough to make it totally useless for a normal player, and only encourages abuse by "<people>" with stupid kingdom poetry creating a 25 warrior cow killer grief machine. That is the only use this will get with this broken formula.