I replaced my first clutch at about 130K, and Im at 230K now. I guess I'm living on borrowed time with this clutch. My old girl spend about 12 years as a daily driver for my wife in stop and go rush hour freeway driving, so I certainly can't complain. I did flush the damper (and slave again) yesterday with my son's help, and its seems to engage smoother starting in first, though I haven't driven it alot in heavy traffic, which is when it usually starts to really act up and get jerky. It feels great shifting through the rest of the gears.
Thanks MY1PATH for the info on the function of the damper. I'm not getting any noise from the clutch when it's engaged, so it sounds like the damper is not a likely cause of the jerky engagement in 1st.
Piste, I'm completely baffled by your problem. Logically, it has to be a hydraulic issue, not a worn clutch, but since you've replaced the master and slave twice, it doesn't make sense that either of those would be causing the problem. Hopefully the damper was the weak link in the system and its fixed for good.