What I mean is as the clutch bite is so high, what's happening to the rest of the travel from that pedal? That force has to be going somewhere as 1/4 pedal travel releases the clutch as this is where the bit is, but there's still 3/4 worth of travel acting on something. I'm wondering whether the extra travel is over disengaging the clutch causing something to then work against the clutch plate. Such as the cover plate splines etc making contact and dragging, maybe?

I only say this as on mine, I was in the middle of setting the clutch up and wound the manual pedal stop in (Tilton floor mount) then got waylaid and forgot all about it. Few weeks later went to move the car it was tough getting in gear then when I went to move off the bite was, as you said, in the top 1/4 of the travel. So I stopped, looked under the bonnet and the force of the pedal being moved past the bite had bent the slave cylinder rod and slightly twisted the clutch release arm! When I told my brother he said it may have done damage to the cover plate splines by over engaging them. Everything is fine with it now, works like a dream, but maybe an idea.