I am using the 12.25x3.75 and I also pulled the baffle out of the muffler to get a little extra flow at higher rpm. I'm pretty sure I could hover it if it'd stop falling away from itself. It's weird because it just doesn't even give any warning. As soon as i get the nose up there and start making a correction, it's nose down. It also won't knife-edge either. Everything is relatively straight to the best of my knowledge. Any other tips? I guess if I just really need more practice I'll go with that, but it just seems like it's the plane more than me.
As a side note, my ultra stick hangs on the prop better than the twist, and I'm using the 11x6 on it. I can't hover it because the surfaces aren't really big enough to get me out of some mistakes but it doesn't fall off of itself like the twist does.
-Eric