I recently just fitted some Heatsinks and they were noisy from the off, front more so, must admit the back took a little while longer to 'bed in'. Maybe there's some crap on ur rims, maybe try some disk cleaner (on rim), or some sort of alcohol based cleaning solvent, being careful not to get too much on the tyre. Could check the surface of the brake pad see if its dirty, if so clean. Other than that, there aint much u can do, maybe try them on another bike see if its jus ur bike.