I need to see a full draw pic first, that shows the tiller. But going from 31 pounds to 40 pounds, means you would have to pike it at least 5" probably. In my opinion, that is too much. You're going too short then, and still don't have a good tiller necessarily.
My advice: pike it one inch from either end. Retiller. Be happy with what you got, and go make the next one!