I had one in the early 80's it was an ok plane. I had big problems with Incidence angles. I set this plane up on a pool table leveled everything up and set all the wing angles. I did a scale paint job over supercoverite powered with a OS .40 FSR. I flew this plane in numerous scale events.
On my first and almost last flight i had to hold almost full down to keep the plane from pitching up onto its back. Despite reverifing the incidece angles the plane wasn't controlable in this set up.
I put a 1/4 shim under the back pad of the upper cabaine strut and abjusted the N struts as well. Then I flew with about 1/4 inch down elevator and it flew fine. I sold the plane to another guy and he flew it several years before it wore out. We never did figure out what i had done to require the adjustments but after that it flew fine. Yes it balanced correctly through all of this. I think I had a few OZ of nose weight as well.
Sparky