What causes a wing to snap roll on me when I pull too much elevator?
I see this on nearly every plane I have. Some are better than others, some are really nasty.

I'm flying an electric 300 and it snaps on me really easily and it's making it so I can't do things I want to do.

Do I need to :
1) change CG
2) Add flapperon mixing?
3) reflex?

what else should I look at.