Installed the M*CARBO buffer set (new spring and padded end plate) along with the tool steel extractor and pins. Then ran my first USPSA match and had no mechanical malfunctions for the first time in months! No stove pipes or double feeds.
However, there were a few cranial malfunctions.....going just a little too fast.
Shortly thereafter I also installed the M*CARBO flat face trigger which reduced my trigger pull by 6 ounces, probably by changing the angle of pull and leverage. Chose not to get their trigger spring set. I have seen too many guys have a variety of malfunctions when they push the limits on trigger pull, lighter loads and recoil springs, etc.
Hopefully these changes will be durable in reliability and I will be able to avoid the mental errors next time, too.