That's kinda odd...Mine balanced at 5 5/8" with the 4.8v battery about 1/2 way between the back of the canopy and the tail wheel. I have servos that weigh 2.2 ozs each. Are your servos lighter than that?

You probably wouldn't have to add very much weight to get it to balance. If you're at 5" back right now you are in the "envelope" 5 5/8" is about as far back as you want to go. It will KE better at 5". So...it depends a bit on the type of flying you want to do. It would fly very nice at 5" but hovers a bit better at 5 1/2 or so.

Anyways...This is my favorite plane. The mighty 110 made it the perfect plane for me.

Thanks
Barry