I swapped out the stock single coils from my MIM Strat and replaced with two antiquities and a Tex-Mex RW/RP in the middle. The bridge/middle position is hum-canceled, but the neck/middle is not hum canceling. Still get the right signal and all, but also the hum. I also moved the middle tone pot to the bridge, in case that has any bearing on it. what should I check/look for? thanks in advance.