If you decrease elevator throw, you may prevent stalling when you pull, but then you will not be doing a 'wall'... you'd be doing a quarter loop as the plane would never stall. The objective of a 'wall' is to transition from flying on the wing to flying on the prop/thrust vectoring.

My experience with 3Ding Caps is that it is very difficult to transition from flying to stalled 3D flight gradually. You get a lot back and forth stalling oscillation. Once it is completely stalled and not even thinking about flying (hover, harrier, etc.), it becomes relatively stable again. Therefore, the more abrupt transition, the easier, all other variables aside.

This is just my experience and observations. A lot will depend on your particular plane, setup, CG, etc.