I think you are using the wrong terminology, it's unlikely the plane is tip stalling during any IMAC routine. If it was reall "tip stalling" changing the lateral balance would probably not help.

I think you are referring to "snapping out", a phenomena where the wing stalls during a maneuver because of excessive control input. This can happen on almost any plane if you use too much elevator.

It is fairly unlikely that everything will be exactly equal from one side to the other. There will almost always be some difference that will make one wing stall slightly ahead of the other. Or, in this case, even though they stalled at the same time the plane would fall to the heavy side. If it's during a loop, say, and the wing stalls the plane will appear to snap out of the loop by "falling" towards the side that stalled or to the heavy side.

By laterally balancing it you got the two sides very close to the same and now both sides stall at the same time. You still may be using too much control input and it can bite you later.

TF