coming in late, i know, but i have the same brakes, Avid BB5 and the same problem. From the get go i noticed the rubbing of the pad on the rotor from the sound it made. The guys told me it was just a matter of braking in the new brakes but, being obsesive compulsive i fidled around there and found that the rotor seemed to be warped. Is this an issue that i should solve by warranty rights or should i just try to straighten it out?