If the front cover of the trans that supports/slides the TO bearing is worn, it's possible that the TO bearing can get 'hung' on it and not release the clutch.

another issue- VERY unlikely on a stock-style setup- is that you're over-extending the clutch and actually turning the fingers on the pressure plate inside out. I doubt that's the case here though.
The fix for that is to add an adjustable pedal stop on the firewall. when I went to a Wilwood pedal assembly, I added one and just welded a small bracket with a nut to the floor, then use a bolt and locknut for the pedal stop.



Can you make this happen in the garage with the car up on jack stands? If so, then you can diagnose a bit further..

.... another brainstorm is the hydraulic fluid is dirty and chunks of crap are clogging at some restriction in the line. considering everything you've replaced, I bet that's not an issue.