Thank you. 6200 is improving, but at this point Iām just adding 9ās to the 99.9% reported earlier. I will probably switch to MemTest86 as that is supposed to be harder to pass, and boots from USB so no more OS corruption issues to deal with (though that is only really an issue at 6400).
I also just turned on that error reporting, after waking to a sleeping computer this morning 
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My guess is that ultimately, 6000 will be faster for my system, but I want 6200 stable to be sure (and also maybe a bit because this is not supposed to be possible).