Wonky clutch poblem

[keepnitsideways]

The clutch in my 92 240sx has been acting up in the last few months. I cannot figure it out.When it gets hot either by the exhaust or the outside temp my clutch disengages higher and higher on the pedal until its at the top of the pedal stroke and it starts to "slip". I was due for a clutch and flywheel so I went ahead and did it. It was okay for a few days and the problem started again. I adjusted the pedal and it fixed it for a few days but still came back. During this process I have bled my clutch a million times. It also fixes it for a few days. I use a clutch bleed kit with the bottle and tube, doesn't ever show and air bubbles in the clear line or bottle. I think im going to drain the system and remove the damper today. Any ideas on what could be going on? Oh and whats the best way to drain the clutch line? Bleed it all into the little bottle I have?

[sx moneypit]

Clutch master cylinder?