Yep, the problem was with my engine...
I just sold the plane to have enough space for the 37%
But I will say it again: it flies sooooo well... Now I'm sad I sold it LOL!
Back into the engine problem: you really should use a good 90 (I was using an OS 91 FX with the ORIGINAL MUFFLER - do not use pitts as I did)...
I've seen people with OS 91FX torque rolling with less than half throttle! And their plane's weights were very close to mine's.
Ah, and also... I only flew this plane 10 times, so I didn't try much crazy 3d, because the engine was breakin in.
Good luck! This plane is sooooo smooth!
Best regards,
Fábio Quintal