I have this plane and I can tell you and VF has told me that the plane is snap prone. You need to reduce the amount of elevator throw until it does not snap out of the loop. As far as CG I'd stick with the recommended location. There is a good thread on the snapping issue....

http://www.rcuniverse.com/forum/fb.a...rflight%2Ctips

and

http://www.rcuniverse.com/forum/fb.a...rflight%2Ctips