I always do an inverted snap roll with down elevator, right aileron, and left rudder. When the plane is inverted left aileron is still left, but left rudder becomes right. Right?

A snap roll is a fully-stalled condition in which directional control is lost, either intentionally or accidentally. It is a "horizontal spin," and the airplane will fall into a spin when the forward momentum runs out if no correctiive action is taken

Wash-in ( a positive angle of incidence at the tips) is a good way to get an unwanted snap roll. Wash-out (tips warped slightly downward) is a good way to keep an airplane stable in the stall.

The PICA 1/6th scale Focke Wulf has a half degree of wash-out built in and it is a very forgiving airplane when stalled.

Packy