on top of that you are also pushing them dominators to the max , I would settle for a lower Bclock to keep them around 1650ish level max. Trfc 72 might also be too tight for them. Try 82 or even 88.
Your low Gflop issue is due to your CPU features settings, though I wouldn't worry much about it. In real world apps you will not notice it...
For stability try playing with the PWM frequency. eg with the 980X here I need 1.285Vcore at 1000Khz, but just 1.275 at 500Khz. Though it's up to you to find out what works best for your setup.
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