OK solved some big problems but still some remain. I was a total idiot and forgot that I had left PCI-E frequency at 102MHz, so putting that back to 100MHz solved the random LinX stops. Another big oversight of mine was using the "All" memory option on LinX instead of 5120 MiB... so correcting that has given my tests consistency that they lacked before.
The GFlops fluctuation problem persists, howeverI managed to get over 84 GFlops (very consistently) by raising vcore to 1.4125... raising it further resulted in a drop in GFlops. I then tested some different memory timings, to no avail, and when I returned to the same settings as my 84 GFlops run (several restarts later), it's gone back to 80 GFlops! ARGH! All my memory subtimings are auto; the only ones I've set are primaries and tRFC, which is at 82 (72 sucked, as did 88). Could that be causing fluctuations?
Running in diagnostic mode did something WEIRD... my GFlops went to 53 when I ran in diagnostic mode, and I could tell something was wrong because at "100% load" temps were 50C lol
Will go back to it tomorrow... determined to break into 85 GFlop territory but it's looking like I might have to use my memory at its rated 2000 8-9-8 for that.
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