Good luck with IMAC! We have a couple of guys at our field that are constantly practicing for that, and there's one guy, name of James D'Eliseo, who just does absolutely INSANE precision. I've seen him take an 80" wingspan Cub and crank it around doing 3D flight. While he's doing it, and we're just watching him make it harrier and roll with our jaws dropped, he's telling us, "Oh, yeah, I might be smoking one of the servos doing this. I mean, it's not really meant to fly like this, but hey, it's a lot of fun." LOL
I dunno if he's still competing, but if you ever see him at an IMAC event, ask him for some ti