Clay, I agree with John, not sure why you needed the extra weight. My Original Saito 80 is close in weight to you 91 and I balanced on the mark with the batt under the servo's.

I also like to have my planes a bit nose heavy for initial flights so do tend to balance nose down. Tail heavy planes just don't fly well. With the big nose on this plane it will have tendency to slow quickly especially if you don't have adequate air flow out the bottom of the cowl. All this can add to a real anxious landing.

On you initial takeoff don't be in a hurry to lift off. Let it go on it's own and if the tail really squats, chop the power and let her settle back down.

JimO