After experiencing virtually nothing but jams with the 115 grain FMJ and British Mk2z 9mm ammunition I found a source of 124 gr. FMJ ammunition and ran a second test.
The difference was night and day and the pistol moves from fishing weight/lemon status to being moderately reliable with the load tested. I would still not choose it as my primary defense weapon, but at least I found a cartridge it will shoot with. 🙂