I like the orcs and the brutal, hard-hitting nature of the list seems good.
I hope to try them out this Sunday with my group. Given the little bit I've heard, they seem to do pretty well at crushing other units initially but don't handle counter attacks well. I think the cavalry army would be hard to beat, but I'd like to make the infantry really work.
For that reason, I'd be tempted to try an oblique formation, and give units toward the slower side the bows. Pick one flank and push that, maybe with a cav unit or two as your fastest side. Let the other units trail. If you deploy right, you should be putting a dead hard unit against one end of their line and hopefully routing it. Having the trailing units keep advancing and adding nuisance damage with bows lets them weaken foes slightly while they're in position to defend the flank of your lead. Once you crush the outside flank, you should, in theory, be able to drive that unit down their line while constantly hitting the point of attack with fresh units, meaning that something should get flanked every round.
I really have to give them a go and see if they work like I think, or if I get embarrassingly routed off the table.