have you tried belt dressing
The cause really needs to rest with the belt itself. If it's frayed on the edges then there may be an alignment issue between the pulleys. If the belt is cracked then it may be an over tightening of the tension arm. If "teeth" are missing off the belt then it's not been tightened enough or in the case of V belts you have oil getting on the belt from a bad valve cover gasket. My bet is on a misaligned pulley.
With Regards to the Finger Lakes.... glad to have you! Come on by!
How deep is the belt seating in the pulley if to deep need wider belt .