The DD mod (adding another factory spring only?) is More holding power than a Barnett SPRING CONVERSION kit or a PCW spring? I'm assuming OEM clutch disc's and steels are preferred over aftermarket (in the Road Star world this is the case).The PCW and Barnett with standard springs are very similar in holding power. If you are going to up power level much then i would suggest the DD mod. The PCW/Barnett will likely suffice for what you are wanting to do.