What did you do to get them stable at that voltage? Mine sadly won't seem to do above 3600 at 16-16-34 @1.45v
If you are testing it on X299 then you can have problems with 3600+. Play with additional settings like VTT or SA/IO voltages. I see you have ASRock in sig. I just started to play with Taichi XE which supposed to be the same OC wise so maybe I will find something. I have to finally finish Patriot 3733 review so will be testing it some more for next days and it's based on the same Samsung IC as your TridentZ.