Honestly nothing special.
When I first got the sticks I booted 12-12-12-28 1T twcl11, trfc280, all others auto at 1.8v, 1.25vccio and vccsa. Reboot, change to 3733, reboot 3866, 55 @ 4000. Then went back to 3866 and tightened. My sticks I was trying too high vdimm, i think they like the 1.8-1.9 range, so if you're higher than that, bring them down.