Just to throw in some extra things to consider. Mark your discs with heat paint to see what temps your hitting? Could justify a cooling duct mod. Knowing and controlling disc / calliper temps, speaking with a specialist race pad supplier for instance. Race rated brake fluid (and a flush if you haven't done one recently).
With your brake upgrade, you using same size pad? If yes, nothing is free, the pad is still exposed to the same amount of work in stopping the car. Work is joules. Presuming same tyre, the car won't in less distance (assuming you weren't braking like a pussy and were braking like a real man ). Joules over seconds is watts. Watts is heat.
Things to ponder is all.