Classic signs of clutch not getting fully disengaged. In your case, due to a faulty slave on the clutch or faulty clutch MC. Worn plate would make no difference, just like brake pads: the fluid will 'take up' the difference for a consistent pedal feel and travel. I would suspect your MC or your slave is bleeding down. I personally would not have any aftermarket hydraulic clutch/slave actuator. Too hard to change when they fail. BTDT and trans R&R is not on my 'fun' list. Since your fluid in the MC is good, it's possible it's internally bypassing, just like a bad brake MC.
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Jeff 
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