set everything to default in bios and report back.
anyways, timing can be changed under DRAM timing config, or something similar.
Make sure you set the OC settings to Manual.
set the DRAM frequency to 1600 (if supported)
Under the timing config, change timings to factory specs, don't even bother tightening them even further yet.
change Vdimm to match DRAM profile, and +1 notch after that, just to be safe.