i agree with wyoboy on removing weight from the heel, my experience is on the m7 but it should be similar as they use basically the same clutches(mine are all but the same as i'm running an '08 m8 primary and 10.4" sec.). i dicked with clutching about every ride for 2 or 3 seasons until i got it where it is now and i think its about as good as it will get. i tried all kinds of setups, cat primary springs from gold to orange/white, many SLP primary springs and a few polaris primary springs. a few different weight set ups with stock and CPC adjustables, 42/36 progressive helix which was very inconsistant as somebody mentioned about the progressives and many secondary springs including the first version of the torsianol kit that RKT sold, but with the torsianol kit my rpms were bouncing all over the place. i tried "THE" m7 setup that everybody swore by with the gold cat primary and the orange cat secondary spring and didn't like it, it felt very sluggish and running the stiff orange cat sec. spring was the only time i ever blew belts. i agree that that spring is to stiff. i ended up with the stock 36 helix with the orange/black SW compression style sec. spring with S/A with the stock yellow/white primary spring and the CPC weights at 66 grams(stock was 67 in my sled), dont remember exactly what screws are in them but i ended up with a bit of weight in the heels and almost filled the tip with as much as i could get without the screw sticking out of the tip of the weight. just like now everyone said light tip was the way to go on the m7 but with the light tip my primary was always hotter than the secondary which led me to believe there was not enough squeeze on the belt from the primary in the higher rpms so i started adding to the tips and it got better. the more i added to the tips the harder it pulled on the top end and the primary temps came down. now my m7 will pull 7900-8000 rpms all day at 8000' elevation without excessive heat in either clutch. my sled will get up and gone as quick as any of the poos or doos i ride with, which is surprising with how soft the bottom end is on a stock m7, and my backshift is spot on. i know its a different engine and my experience may not pertain to an m8 or m1000 but thats what i went through to get good clutching out of the "crappy" clutches cat gave us to deal with.