there is no need to “ stall it higher”
It would be very unusual if the car was any faster leaving off the foot at 1500 or 2000 than 2800 or 3000.
Just find a nice relaxed, repeatable spot to launch it.
It might well be the convertor is somewhat tight( not necessarily a bad thing) that makes it push at 2800, and nothing to do with your brakes.
Making a run at the convertor at a lower Rpm can sometimes make it hit harder , than having the suspension all tensed up.
