I always had good braking performance out of my stock calipers, master cylinder and good quality braided lines. It's a matter of getting them bleed so there is no air in the system.
I always use a suction bleeder and bleed out both ends.
Of course my brembo billet aluminum calipers with the brembo MC, braided lines makes the RS stand on it's nose with a single finger. Took a little to get used to, and the learning experience was a little frightening for people around me. They weren't expecting me raise the rear tire that high while trying to out brake them
Made them run off course cause they didn't think I was going to make it, while I took the spot from them in the race 
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Charles Gallant