I also have very large feet (size 13) and fabricated offset pedals but mostly to facilitate left foot braking. I have crappy bronze bushings not really nice needle bearings and have never had an effort problem with everything from a stock original 427 Ford clutch to a dual disc McCloed racing clutch. My pedal may be lightly taller than yours but not that much (see photo). Maybe you should have some else try it and see if it feels normal to them.
