A worn belt means the pucks are farther out in their slots, farther out from the center and therefor more affected by centrifugal force. Drag sled guys will swap in a belt often to maintain consistency. The worn belts can then be saved. At some point, the clutch can be re-calibrated to the slightly worn belts and run through all them.
Since I doubt you want to go to that effort, I would suggest changing the calibration. It is basically set up at the bottom end of where the engine makes good torque. So as soon as the RPMs are shifted down a bit, it is boggy. If you put in a stiffer spring, that will shift the RPMs up and give you more wiggle room on the state of the belt.
The original belts were Mitsuboshi. If they were Salsbury, I could see Honda sourcing them from Comet since Comet bought Salsbury. It seems odd to just switch manufacturers though.
