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Yes, I've read a lot about ZDDP, and have bought Valvoline VR1 for a particular application I have. I've also run low ZDDP oil in non-roller engines for many thousands of miles with no problems. The "certain conditions" you wrote is probably a good qualifier. Although I put VR1 in my 250 last time I changed the oil, I'm temped to run low ZDDP oil next time just so I can report my findings after my next valve adjustment.
Have you actually seen in person cam and lifter galling that you can attribute to low ZDDP oil? I had a BBC cam wipe a couple lobes once, but it was way before ZDDP levels were lowered, and it was a triple valve spring setup.
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