Hydraulic TOB with 3 finger Clutch

You confused me, isn't overcenter spring for the mechanial pedal assembly?
You, I guess, are using your pedal with the master cylinder.
I have a American Powertrain TOB with an old Airheart cylinder in the floor.
The MC returns the pedal with no spring.
However, the PP I was using, B&B 3200 lbs pressure, was too much effort for my leg.
I went with a McLoad diaphragm unit and have been happy with that setup.