I've noticed on mine that when I got the CG correct it no longer wanted to tuck to the belly. I took all the mixing out and it is pretty neutral. Just wants to barely climb when inverted (have to give it just a little back pressure on elevator to get it to go straight and level). It will knife edge loop with only small corrections. I also dialed in more right thrust. Engine is Saito 56 with APC 12x6, JR DS811 servos on flight surfaces with HS225 on throttle. When the tank is almost empty it is a pain to land if windy (this is the only negative).

Have fun,
Jon