Take spring out of primary put cover back on and see if clutch slides in and out easy or hard, had an 05 venture that slid hard and felt no matter how i clutched it it would bind and slip when going slow, only fix would be softer belt and more aggressive curve on weights and14.5 rollers to get better squeeze on belt at slow speeds, the stock flat profile weights are not good for bottom end grip, can also try lower rate spring for more grip, just a few things to try if all else is good