Well, it's a theory and I'm trying to test it. First test failed to confirm the theory. There's some logic to it, though I discovered one issue with it--boolit setback due to insufficient neck tension that occurs when a round is chambered.
It's clear it's the lube burning--the question is why, and when others like Gloob insist they shoot lubed boolits w/o smoke, well, either he's trolling and trying to get me to spend money and time to no end, or there's something here I might be able to learn.
I have a few other variations to try--can't do it this weekend as I'm otherwise engaged--but the first test was shockingly ineffective. I'll keep moving forward on it; at least I can still PC boolits to eliminate lube smoke.