Im running KB with a 3" kenne bell (17psi) pulley and a gates belt along with a 90mm idler. I seem to be experiencing just a slight bit of slip. Over the weekend I put on a gatorback belt and a 2.75" (19psi) pulley and about 5500-5700rpm the thing just smoked and HP peaked and it fell on its face. Who is making a good nonslip pulley setup for the KB?