[John Sabato]

Unless you are a gunsmith with the ability to add metal by welding and then reshaping the lever, If you only have one trigger lever, your possible adjustments are limited to removal of metal that is not necessary... This may not be your problem... Unless I am mistaken, I think what Tom Heller is implying by adjustment is trial and error testing of several levers to find one that fits best.

OTOH, Check for burrs on the 3 flat lever surfaces that engage the disconnector and the trigger. There should be a smooth bevel on the leading edge of the top of the lever that allows the disconnector to slip under the lever when the trigger is not taken up.

Does the lever in the sideplate appear to have received some post-manufacture grinding (like an amateur attempt by a previous owner to modify the trigger pull?)

The three flat surfaces on the trigger lever each serve a specific purpose, as does the bevel on the leading edge that faces the disconnector during the firing cycle. all of these surfaces should be smooth, clean and lubricated.