What are the specs on the factory ZR1 master? It stops just fine with little heat in the rotors. From what I understand, there's nothing magic about the CC stuff until you get into ABS programming, which isn't an issue here. I'd expect with a proper master you should have good brakes with the possible downside being that they'll get grabby and prone to locking up when you get them good and warm. Opposite of the issue you're having.
Edit: just realized the lack of power assist will make that comparison to the factory part less meaningful. Maybe Tobin with Kore3 can assist, he's good with the math stuff
