I just stuck some 8 inch rotors on my NRS. They sure look big and intimidating (I had 6 inches on before). The reason I switched over because sometimes on decent it seems like my brakes arent grabbing that well. At a certain point the rear brakes starts to squeal. I do mostly downhill and uphill...nothing extreme. I weight about 170lbs btw. Should I stay with the 6 inches or go with the 8 inches. Oh my brakes are mechanical Avids.