Dry fire it with that plate installed and note carefully if the striker goes forward with only minimal rearward movement of the trigger. If so, that would suggest that plate trigger lever is too thick where it contacts the sear and is letting the firing pin go forward too quickly for the trigger to get to the rearmost position before sear reset (with live ammo). It's a good place to start your trouble-shooting.
I have this problem with a 1916 Erfurt P.08. I can dry-fire the pistol, and maintain a fully rearward trigger position, and follow that up with pulling the toggle back fully and releasing. In that instance the trigger fully resets but with live ammo it doesn't. This, of course, is a very slow reset and why I think it resets in dry-fire mode.
An often suggested fix (if you would rather try it first before buying a new, expensive plate) is to file a few thousandths of an inch off the the area of the trigger bar that depresses the sear. I would start with removing .005" of material, test it for function with live ammo, and repeat for another .005" if it still won't reset the trigger. I wouldn't go any further than that though.
If all that fails then you probably don't need a whole plate assembly, just the trigger lever and pin, at least IMHO. These can be found on Ebay fairly regularly. Good luck with it.
-Bob
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