I have two different sets of springs that I can use on my bike. I've got some that are slightly stiffer then the stock ones which I've been using for several years. I just got a parts bike that has some that are so stiff I don't know if I would be able to down shift smoothly. I've noticed a little slippage lately and all the plates are very close to new dimensions. Will the extra stiff ones make that much of a difference?