Clutch Slip on new clutch :(

[Fazerider]

Are you still using the original clutch springs? I reckon the OE ones are a bit marginal... once they've been in there for a decade they lose enough strength that slip is inevitable. Be careful when buying aftermarket ones, some labelled 'heavy duty" are about twice the strength, that puts the clutch basket at risk as well as requiring hands like a gorilla to squeeze the lever.