Ok so I got my undertail installed and set my rear shock on 6, I go about 220 and my girl goes about 150 Pray to god she doesnt see thiss haha any way we wnt for a small ride and came back and noticed my rear tire had rub just alittle so i set the shock on 7 and the rear damper on 4 maybe this will take care of it I hope!!!! But if not, will a shock off of a 750 work??