Originally Posted by sel2real
i'm going with the clutch return spring theory, as i've had this happen to me on a car i changed the clutch from the long style to a diaphragm style. the "return" spring is more like a helper spring that has a break-over point to "help" the pedal go down after a certain point (which long-style clutch pressure plates needed!). since you went to a diaphragm-style, pedal effort is significantly reduced.
Very good point. The diaphram clutch does require a lot less of left leg pressure. I suppose that is why they have become so popular. I never liked the things because back in the sixties on a performance CHEV the diaphram plate would collapse on high RPM speed shifts. I guess they have overcome that problem. But you are correct in the spring strength helping to depress a finger style plate.