What did you have on previously?? I run the same setup as you, i do alot of trackdays and never really felt that the car is massively underbraked, i use ferodo ds2500 pads though which really make the difference imo. With the braking setup on an rst they never tend to be 'bitey' like on modern cars due to the servo setup/master cylinder but should work well when you stand on them! Due to the nature of good quality high temperature pads they also aren't great till they're warmed up a bit. If you have already used good pads etc then i've heard the st170 braking setup works well on rst's and shouldn't be mega bucks to get hold of