How big is your supercharger pulley? Have you tried swapping the pulley off the manual tensioner to the auto tensioner?
If the belt is jumping off the pulley- then it's not tight enough. It may look tight- but look at the tensioner stops... If they are close to touching or touching- the belt is too big. The reason why it's popping off is that there isn't enough tension and it's just rolling it off the pulley when the motor is running. I've destroyed a couple that way when I first started.
Btw- the auto tensioner pulley is 3in. Maybe look at supercharger.com and see if they have a smaller pulley from another kit.... Or go with a smaller supercharger pulley 🏻
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