xfr is built so stupidly. reaching 3.8 is so marginal even the worst cpu can easily oc to it. all games are **** coded for single thread especially with dx11. what you need is that single core boost even on a extreme oc of 4. most 1700 can do 3.8 at 1.3v which is very easy on thermals.
I just flashed the 4207X bios into my board last night(Prime X370 Pro) with 2700X and Ripjaws V DDR4 3200 CL14 B-Die.
Edit: Everything seems okay with the 4207X unlocked bios. Although I don't know what some of those settings do exactly. I tuned in the ram at 3266 and so far it seems fine. Thank you very much for the hard work you put into the newer unlocked bios. It is greatly appreciated.