You're already going to be outbraking the rears if you upgrade the front brakes so all wheels are unlikely to lock together. Rear wheels locking before the fronts is to be studiously avoided as it makes for seriously scary corner entry.
Are you concerned that the weight transfer forward on braking along with the upgraded brakes will unload the rears to the point of locking? .... that would seem the only scenario you might want a compensator.
K
