[MEvang]

I have to correct you on one thing. If you have better braking power you will generate more heat. This is what stopping is all about. Very basically you are taking the kinetic energy of the moving vehicle and using the brakes, turning it into heat. So brakes are basically heat generator the, bigger and better the brakes, the more heat it can generate.
After you turn that kinetic energy into heat the next thing is to get rid of it. Heat will be dispense through the rotor/drum, into the surrounding steel parts, hub bearing caliper/wheel cylinder, upright, and even the wheels and brake fluid. And then into the air. Physically smaller brake components don't dispense heat as well as larger heavier parts. This is one likely reason Toyota moved to larger calipers.
Now the problem with too big or too aggressive brakes, and yes you can make brakes too big. Brake can only perform up to a certain point and then the tires loose adhesion to the pavement.(Lock Up) The weight of the vehicle and the brand and size of the tires contact patch has everything to do with this.
For instance if the Revo you have, have a good grip to the pavement under most driving conditions you can get away with more rear brake pressure.
Problem is as a manufacture Toyota has to play it safe. GM took a big hit for trucks in the '80s that would easily lock up the rear brakes. Of course nobody talked about what tires where on these trucks when the began to have problems. (Likely old and bald) So you can see they must keep rear braking pressures on a pickup under stricked control, wet or dry pavement and loaded or unloaded. The LSV does a good job of this when correctly adjusted.
Mike