In my tests, fixed 2H Billmen (and fixed 2H DEKs too) completely destroy fixed shield Dismounted Knights. I don't know if this is a "2H fix issue", but they seem overpowered.
Part of the problem is that for such late era units they are very underpriced. HB are easily worth 700-800 Florins according to their stats. Likewise The Bill and Halbered are relativly similar weapons, I'd expect a bill unit with a given set of stats to perform about as wel as a Halberd unit (like JHI), with similar stats. this they do admribly. On the flip side they do go through Sword and sheild units a bit too quick IMO with Foz's version iof the fix. 2 extra defence skill dosen't really change things overmuch, but it does push things a bit more towards sensible, (i.e. the 2-handers can beat Sheild units well, but not without some losses that WILL have knock on effects).