althou a new clutch shouldnt really slip as such running more than standard power what sort of power u actually putting thru it just out of interest?!
Mines being a bit of a pig too, cable snapped on me the other day and had 2 fit a 4x4 cable as was only 1 the place had, its a bit longer but shouldnt make a different to the operation of the clutch. The biting point is now near enough floor level and seems not to have much tension in the cable so thinking mu ratchet might be a bit buggered so gonna have a look at it at the weekend!!