Hi,
I'm still learning this one, however it seems to me (at least with my plane) that its too easy to over control with elevator than rudder (i can do it on G2 for hours). Try to smooth out the roll...as when i started they looked like a series of flick rolls!!
The best method i've found is use a slow-moderate roll rate and 'fly' the controls rather than 'stick banging'! which i know alot of 3D flyers do.
Looks good when you can do it though!