Set your low rates to 10-12 degrees of throw MAX and fly the plane again. You should not have any snapping issues at these throws with an Edge. The best way to verify that the elevator halves travel together, if they are driven by seperate servos, is to make a pair of pointers from a pair of clothespins and .070 carbon fiber rod. Clip the pointers on the elevators and fiddle with them thill they are even with each other. Now move the elevator through it's full range of travel, the pointers should track each other as closely as possible.

Also, a nose heavy plane will tend to depart with hard elevator pulls. Tail heavy planes will depart but the departure is softer and less violent.