Well if the balance is off side to side, I generally add small bits to the wing tips if needed. Never tried it in the stab like you mentioned. Not sure 100% but it seems like you would snap off your stab in a maneuver that requires lots of elevator if the weight is not centered on it. Someone else may have a better idea of that. Weighting the wings tips allows you to use less weight to achieve the same goal. Just a thought,

Kevin