My clutch slips in 3rd and 4th gear under heavy acceleration.  Other than that, it's fine. I just roll on the power instead of romping down on it at 60 and all is well.

I know it's a different problem than yours.  Just saying I don't know what to do for it either.  That's why I haven't ventured a guess.  Although, the little rocking thingy inside the case does sound plausible especially with the amount of slack varying on you.

If youre not letting it tach down & just fanning the clutch & grabbing a gear, it MITE slip a tad, but if it starts tachin up & not accelerating at high speeds in high gear, youve got a booger,,

Relevant advice from Greg's Cafe' thread, have been spliced into this thread,.. to consolidate info on this problem...
Best luck, Greg...
Update us with any new progress, info, or symptoms...
We do want to be as helpful as possible...
- Serow

I currently have a stock clutch, a modified engine, and tall gearing.  I have never had any clutch slip as long as the throttle is released between shifts, and the clutch lever is fully released before you grab a hand full of throttle.

I do believe I have experienced a slip once of twice prior to the engine being fully warmed up.  Also if I get in a hurry and apply full throttle prior to the clutch lever being fully engaged....the clutch will slip until you let off the throttle and let the clutch engage.  The clutch just doesn't have enough grab to stop the slipping once it starts when full throttle is applied.

I bought some Barnett Kevlar discs and will put them in some day, and I have some EBC 10% stronger springs to install - but if I make sure not to apply full throttle until the clutch is fully engaged......I never have any problems.

The stock clutch is adequate to handle a stock engine and gearing, and if you are having slippage under application of throttle alone - then you either have an adjustment issue....or plates contaminated with friction modifiers from engine oil that isn't compatible with a wet clutch.