I have heard good things about carbotech, but I have not personal experience.
We tested a lot with Pagid, Performance Friction and Cobalt. Cobalt and Pagid proved to the the best performers, but Cobalt was more cost effective.
The Pagids tended to "cermicatize"(made up word) when they sat around between events. Basically oxidation, and they became junk. the Cobalts had as good feel, better customer service and were WAY less sensitive to being exposed to oxygen after a heat cycle.
We are tough on pads, big power big weight. the SL-C (superlite).. is probably a lot easier on pads.
We worked hard on initial bite of the pad for two reason 1) power brakes make it hard to soften the intial hit 2) Once ABS hits (we use the Bosch race ABS) it starts pounding the pads, and you want the initial torque to be such that it doesnt start another cycle of ABS.
tuning pad compounds is different (and easier) on a "proper" non power braked car
You usually want to tune more aggressively on initial bite (high wheel speed = lots of inertia to slow down) then you want the pad to trail off a little.
Also, if you have high-range tire temp sensors, aim them sometime at the rotor under braking. You can tell how much your calipers are flexing by how linear the temp gradient is across the rotor.
