[Fordors]

I would think that the marcel is not a factor in finger height variation, all it is is a spring steel wave washer and when the spring pressure clamps the disc it flattens it out.
Shimming the yoke of the high lever will lower that finger to the level of the others and since you have two that only vary .005 your fix is relatively easy. Loosen the bolt on the clutch cover that holds the yoke and slip in a shim. The question is how much shim is needed because of the lever ratio, but trial and error will help there. I would use a shim with a forked shape to help keep it in place when tightened.
The alternative is to disassemble the PP and mill the two yokes that have the low levers, but I doubt you want to open that can of worms.