Any signs of fluid leakage on the carpet in the driver's footwell??
You have replaced the clutch and slave cylinder- I'm sure more expert minds on here will be able to establish if you installed good stuff or a hostage to fortune..
I have a very simple view, distilled from mostly here- if the clutch needs doing, replace the slave while you've dropped everything out, and top it all out with a new master- otherwise, seal/component degradation in the older units will damage if not destroy newly installed bits 'n pieces.
Simples
