Clutch not fully disengaging - why?

[Xcellr8]

I've determined that the clutch on this 1998 manual transmission is not fully disengaging. That is why, with the car in reverse, and the clutch pushed to floor, that when turning the key to start the engine, the car moves backward a little as the car starts. Further, the clutch action (engaging, disengaging - as little as it does) happens close to the floor.

I've bleed the clutch properly. Upon closer examination of the clutch line, I did find a pinch, not a block, but certainly the flow is impacted. Now, I need a specialist is hydraulics. is the flow just slowed, or is the flow actually less because of the pinch?

My opinion is that the flow is slowed. That a full push of the pedal will push the same amount of fluid through the line, but not a fast because of the smaller diameter of the line at the pinch. But, if I'm wrong, then the lesser amount being pushed may explain why the slave cylinder is not moving its rod enough the fully engage/disengage the clutch. Keep in mind too, I believe there is a power assist to the clutch, just as there is a power assist to the brakes. They do after all, share the same reservoir. Am I correct about the clutch being power (vacuum) assisted?

Certainly there is an Engineering graduate who had hydraulics that has grown up to own a Porsche. Help this commodity trader out.

Thanks,
Joe