Here are a few methods to improve braking performance.
1. Engage the front brake a moment before the rear.
2. Use a "flutter" or "oscillation" method to (a). Not lock the wheels (just like ABS in your car) and (b). Give the rim time to dump excess heat
3. Alternate between having the front and rear brakes engaged. (more or less the above method).
4. Plan your line, plan your braking. It is not the same as an alloy rim.
5. Remember that even a second or two of disengaging your brake is usually enough to dump excess heat. Having your pads engaged consistently for an extended period is the main cause of heat damage, i.e. doing a big descent with your brakes engaged the whole time.