Clutch pedal sticks in down position

I have had my clutch pedal stick to the floor when powershifting @ 5000 rpm. Pretty scary! As soon as the rpm came down the pedal popped back up. I had all new clutch and all linkage was either new or re bushed. Adjustment on the Borg and Beck (3 fingered) clutches is critical. I remove the inspection cover and adjust the linkage so the throw out bearing almost touches the fingers. (1/16" gap) That's what worked for me. tmm