I have a duraplane trainer 20 it flys ok but in a turn sometimes is seems if you bank it to far it well stall and go into a spin. I have been able to pull out of the spin but just before it gets to the ground. Has any body had this problem with a duraplane. I built it four channel. Could it be do to to much control movement or cg. in wrong place? Any help would be appreciated.

Sounds tail heavy to me.