Thanks, Gil. I like the thinking about lube failure with two rings. So I’m good with one in the top groove as supplied. That’s good to know also.
I’m running zippo and MMO, eyeballing the mix, and it seems to be plenty slippery enough. I stretched the governor springs only slightly, and today, for the first time, after a bit of run in, I was able to tickle the needle valve and get it to single hit A strong pop, with a long Coast between hits when not under load. Gotta love it.