Been a while since I played with wheeler clutching mag, but it is very similar to the sleds. I am assuming that you would like to slow down the upshift alittle and keep your r's up. If so, start with just picking a little stiffer secondary spring. I played around alot one summer with my buddies 500 scrambler. I tried alot of different combos and forget just where I finally ended up at. If you do much clutching on sleds, It should not be too tough for you to get the wheeler to act the way that you want it too. Actualy the secondary on those is just a p-90 sled secondary and has a torsional spring. Open it up and see where the spring is set at. If not on the tightest twist, twist it all the way tight. That alone made a big difference at no cost!