I took my Hellcat to the field a few days ago...a knock-off...not CMP. Fiberglassed the wing, CJ retracts, repainted etc....
Long story short I found that at 127 mm CG the plane flew tail-heavy...started to baloon on me.
Elevator was very sensitive and needed quite some down elevator to get get a semi-ok flight. With wheels down it flew much better.

Put some more weight into the Cowl (epoxied lead into the lower section) and trimmed at 122 mm CG.

Any feedback re CG's on the Hellcat ?

Pete