I tried to lower my VSOC further, but my IMC refuses to run 2133 FLCK without a 1.27 true VSOC voltage. Are there any other settings that could stabilize a lower VSOC?

PBO +200 isn't possible with the current FLCK; either, I had to settle for +100 as IMC lowers the memory clock to compensate for the added load and it becomes unstable.