This is all great information. I appreciate you sticking with me throughout. I have learned so much from you over the past few days. I downloaded Core Cycler and it's currently running. It already threw an error on one of the CPUs (the second fastest cpu not the gold star one), but I'll probably have to run this test overnight for multiple iterations.What curve optimizer does is to lower the voltage at the high end of the V/F performance curve of the CPU core, the highest frequency end. It might do nothing at the low end and very little in the middle.
Yes, -30 is VERY high, probably too high for your gold star cores which already have a steep negative voltage offset from the factory. But since you're testing with a heavy load it's not changing the voltage much since the CPU is operating in the middle of it's performance curve. You have to test with a light, bursty load that makes each core boost to it's maximum clocks repeatedly. There's a tool called Core Cycler, go looking for that. It sets up a light, bursty load and cycles it through each core multiple times. When it crashes on a core, that's the one you have to reduce the negative offset a few points.
It's one of the better tools to see if you've lowered too much, but another one is simply gaming. Gaming is inherently light and bursty so it will crash an unstable core, usually resulting in a BSOD. The problem with that is figuring out which core crashed, but there is a way.
Tweaking in extreme CO undervolts can be hard, that's why most folks just dial in a -10 or -12 on all cores and call it a day. But also, pay attention to the PPT, TDC and especially EDC settings for best performance. EDC in particular can be counter-intuitive in that lowering it 10A or 20A from stock can improve performance in heavy workloads.
I'll definitely lower it from -30 to -15 for all of them regardless, just to see where it stands at that point. I do game a lot, so I'm sure I'll find out if it's unstable or not very quickly then eventually once I figure out the appropriate curve, I'll apply all of these settings in the BIOS so I can stop running Ryzen Master.