I finally was able to make a decent aerobatic fly from my extra 300. This airplane +TT. 1.20 make a great combo, I was able to pass from taking off, straight up, to Flat Spin in seconds. WHAT A THRILL!!!, knive edges,hammer head, rolling circles etc. It really makes me look better pilot than I am.
I even lost a tire without consequences, I used flaps and landed in a coin.

I got 8,800 RPM , using medical castor Oil and zero nitro, head gasket removed ;80/20 and 15*8 Tf. Prop