Guys:

I had this problem with my AW Extra 260 .60-.90. I asked a similar question to the original poster, and received suggestions about reducing elevator throws, being more gentle with up elevator input, etc, all of which were to a degree helpful. The issue I, and I think the original poster, had was that the snappiness of the airframe was / is way beyond the plane being aerobatic. An answer for that airframe was that, simply, the plane was too heavy for its wing area - that is, wing loading was much too high. This situation results in the amount of lift generated for a given angle of attack is too small to support the lift required for positive G maneuvers, and hence the AOA increases to the point of stalling the main wing. Is the AUW of the aircraft OK? An 85cc gasser in a 27% Extra seems like a lot of engine and wt. Might be useful to calculate the cubic wing loading.

http://www.flyrc.com/calculator.shtml