Anyone running this primary having lots of chattering around 4500-5000 rpms. Also at what rpm does you machine start to pull itself. Mine will start to pull around 2800, it engages at 1900 or so. Also I'm running a gates c12 belt and I've had to pull all the weight out of the mid nothing in the toe and two tungsten washers on heel. All I'm getting is 7500-7600rpm at shift out.