Do I uprate master cylinder??

[Ed Doe]

Red stuff pads sound a bit shit... have you tried something like Mintex 1155s or Ferodo DS3000s? You sound like you know what you're doing, but imo EBC should be avoided at every opportunity... and I know from experience the Mintex 1144s are brilliant fast road pads; 1155s should be better still at the cost of some cold performance obv...

The competition brake fluid you're using; did you properly drain the old stuff before putting the new in? If they've mixed it could be the reason you're having issues...