Point 1: Oh so you were running "numad" in the background? NICE TRY making us all run in circles while you pulled strings in the background
Point 2: On your performance "clustering" issue, there are plenty of possible culprits but here's a simple setting that might help: Make sure your CPU governor is set to "performance" instead of "ondemand" or "powersave". Most Linux distros default to "ondemand" to save a little power, but in your case you don't want all that extra logic complicating things. I'm not promising it will fix all your problems but at a minimum it shouldn't hurt.
Another point that's maybe so basic we haven't brought it up: What kernel version are you running? I highly recommend a very new kernel for a Threadripper since you can't expect perfection from a scheduler that was written before AMD threw the 2990 over the wall.