Do you feel it slipping or does the attitude tell you it's slipping? Ignore the attitude. Mine tells me my stock clutch is slipping anytime I'm accelerating. I've seen 40% slip before and never felt it. I don't think my stocker would have made it 90K with the Juice installed if that were true.
Try a search for clutch slippage with Juice. There were a few threads about this a year or two ago that might help.
If it is you clutch, Southbend (SBC) seems to be all the rage around here. That's probably where I'll go if mine ever pukes.