i'm trying to switch my old mtn bike over to a cyclocross bike. i picked up a set of tektro oryx cantis to use with my 6500 shifters (apparently Vbrakes dont work with STI levers). i'm fairly confident i have them set up correctly. anyway, i tested them out yesterday and the braking power was less than desirable. is this a common problem? what are some cheap solutions? attempt to use the vbrakes anyway? different brake pads?