So i've got hs-33's on the rear of my new bike(xtp), and it just aint happenin'. I've got a 4- bolt booster, light grind, and have tried plaz(no grip in dust) and monty milk(needs a heavy grind) pads. last weekend at fontana, these brakes caused many points and a nice bloody shin. Every thing is set up correctly, brakes have been bled, pads are hitting flat against the rim. Things were so bad, i had to resort to tar to finish the comp. Any advice guys?