I weigh just over 200lbs and my settings are on my 800X (pretty well the same as the 7C sled) as such. Front shocks I set at #4, the center shock I SOFTENED it from stock a few turns and the rear springs I have on the second tab. It used to push "out of the box" but now it turns like its on rails. My machine will bottom out when I hit a big jump but thats about it. When I do bottom out, its no big deal as I am standing and then it becomes a nothing. If you make it too stiff, you will not use all your suspension travel and then you will get a real harsh ride and start bouncing all over the place... kinda defeating some of the machines qualities. I left my coupler in the stock position, when I moved it fat side back, I got alot of track spin.
Maybe you have some bad shocks? Take it back to the dealer and get them to look at your track ratcheting and get them to check out your shocks.