I believe I found the fix for my particular gun. Gen 3 19, S prefix SN with 336 ejector. I was having the common brass to the face and weird stove pipes. I installed a LWD extractor, which solved most of my stove pipe issues. I still got the occasional brass to the face. I installed the new 30274 ejector last week. Took the gun out shooting, fired 200 rounds. All brass ejected strong and consistent to 3:30.
I'll keep shooting it until it malfunctions, or proves itself reliable.