I've had two of these savages for more than 40,000 miles each. Both of them started having "Slipply Clutch" problems at about the same millage.
What I have found is :
the clutch pack does not fill the min. space between the sides of the clutch pack . apparently both ends are made of aluminum and wear to the point of not being able to tighten up on the disk in the middle.
I proved this by putting two of the "Extra thick (.135")" fiber disk instead of one thick and all the rest thin disk (.115) , for a short term fix. For a long term fix I have bought an extra metal disk (.062") to put against the aluminum end piece.
That extra .020" made the clutch stop slipping.
When the aluminum wears more and starts slipping again I'll add the .062" to protect the aluminum from further wear.