Sounds like one or both of the plates have a high spot on them and need to be indicated and trued up on a lathe.
The spec in the service manual states "approximately 1/32" (.03125) clearance for the button when in the on position, fully engaged, lever forward.
Start there.
Make sure the threads are good in the adjuster and rods and have the jam nut installed and tight once adjusted.
I would suggest a jam nut on the left hand threaded rod as well to take up more of the slop inherent in this type of setup.
Make sure the rods and holes in the levers themselves are not overly worn as well.
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