I have the same problem with the sled going flat on the big end. The RPM's seem to hold all the way. Running a 46/36 Dalton, so I have a low finish angle. I am running a machined fixed sheave on the primary. Dony know if this is part of the problem. I know Jeff Simon is running HH now instead of HC. If I ever get it right, it will be a great setup, because it is stout on the bottom to around 95 - 100 MPH.