I didn't seem to have too much balancing mine at 5.5 with two elevator servos in the tail. In fact only my ign. battery is on the motor box. The receiver batt is under the aft part of the tank tray. About the only CF spinner manufacturer out there seems to be Pete Models and you can find them on RCShowcase, Troybuiltmodels etc...

Bisson does a nice fiberglass spinner which I actually prefer (I've tried both of them) because it seems a bit stronger to me.

John