2. My Base PPT has 800mV on all P States from P1 to P5; P6 is also 800 set via ODT;
Mem P states are also set to a base 800mV,
This is exactly what I was saying caused problems. Try either disabling all lower p-states in your ODT profile, or set the lower values higher than 800 - for instance, as a quick POC, just write 850 to all but p0 (both mem and core)
Re-reading your post, the only difference i see is the driver, which im in 18.6.1 and you in 18.11.x
Maybe try that over the weekend. What is your exact driver version?
I dont remember off-hand, but it was the last version of 18.x. In general, Ive seen no noticeable differences between windows driver versions since at least 18.6.1 for any algo (and Ive tried most) unless using an wolf0/xmr-stack (or clone) miner, which had an issue w/ >18.6.1