Replying to 77 or 85, the decision is killing me.

So I'm getting some new Walls and I can't decide if I want to go with 177s or 185s. I'm 5'11 and 175. I've been skiing 177 Walls for awhile and they sometimes feel a little short. I ride schweitzer quite a bit of the time but I usually spend a good part of the spring in Mammoth. I'm leaning towards the 85s but what do you guys think? I'll still have my 77s for urban too. I know the 85s will be better for most everything I just don't want to be kicking myself cuz I can't really jib on them.