I would first see if it is voltage, bios, or bclk issue.

Drop multi to 17, turbo off, and try to boot at 17x190+, but also increase qpi/vtt to 1.35, and DRAM 1.66v-(gives 1.65 in cpuz on most, if not there already). If increasing qpi/vtt works, you can then back down to see what you need.

If that does not work, try 6 multi and 13 for UC and also 8 multi and 17 UC.