yeah don't put any crap on the belt, the reason it's squeaking is because it's either loose, there's something leaking on the belt, or one of your accessories is binding up internally causing the pulley for it to not spin freely. suggest taking off your belt(s) one last time and making sure everything's spinning freely and there's no roughness or scratching sounds when you spin them, also check all your tensioner/adjusting hardware and make sure you're not missing any of the screws that help hold things in place.