uhmmm, wierd, i thought that the pwm was still under development.. i will have to try it
what i did to avoid getting the servos to hot was to bang some values where i know the servo remains on a fix (not jittering) position.
one other thing that might help is connecting to ground all the analog inputs you are not using...in case you have one at least activated..
my 2 cents..
have you tried with stepper motors? i need some idea or patch that helps me understand how to set the 4 values to control it.