My Funtana 90 rocks pretty badly in harriers and elevators.

All servos in stock locations per the manual, Saito 100. Battery mounted out front(you can see it through the right cowl opening).

I first flew it with one ounce of lead right behind the fuel tank. Lead came loose and got stuck behind the right elevator servo(found out after the first 3 flights). I'd assume the CG was WAAAYYYY back. Probably at least 8.5", mabye more. Elevators were solid as a rock, as were harriers with no wing rock. Harriers were tough due to the extreme aft CG, it would pop into a hover.

Removed the lead from the tail, and added 3oz on top of the engine mount beam. CG is right around 7-7/8", mabye a tiny bit more. Wing rock is now prevelant in harriers and elevators, and it's bad, even with spoilers up.

I'm not sure what I might be doing wrong...[&:]

Too much elevator throw?
Move the CG back another 1/4 inch?

Or am I just flying it wrong? I've tried very steep AOA harriers to be sure the wing is deep stalled, but it still wants to rock. Heck, my UCD has less wing rock!!

Any help appreciated.