I recently installed a set of Avid mech. with XT levers. They don't seem to feel right. I have Avid's on another bike with XTR levers and these feel completely different. The XT's have to be squeezed extemely hard to get decent braking while the XTR's seem to work great with hardly any effort. Is there that much of a difference in the two levers or should I check the set up again?