Help - TridentZ RGB Series 32GB (2x16GB) DDR4 3200Mhz CAS 16 F4-3200C16D-32GTZR

[Globespy]

I have only been able to get stable 3400Mhz at 16-19-19-37 at 1.360v Comand rate of 1. These sticks report as Samsung B-Die in Thaiphoon burner but the sticker on the side relates to Samsung C-Die instead - a common issue with Thaiphoon not reporting correctly. I used Karhu RAM test overnight at 9000% which is rock solid stability. Can't figure out how to get any higher, and not sure it's worth it unless I can get close to 4000Mhz. Appreciate some insights.

i7 8086K @ 5.2Ghz all cores 1.385vCore
Asrock Z370 Extreme4

[GSKILL TECH]

Do you have the latest BIOS? Are modules in slots 2 and 4 away from CPU?

Try a higher Voltage to see if it can push higher

[Globespy]

Yes, slots a2 and b2 on my board.
I am on BIOS 3.10 and there is no need to go beyond this BIOS on my motherboard as they only relate to 9th gen intel CPU support.
So stick with the same timings and just increase the DRAM voltage or DRAM and VCCIO?
Or might you have some suggestions on timings I can try or just try the motherboard programmed options with the higher voltage?

How high can I go on DRAM voltage or VCCIO with these sticks? I think I read that they are not so safe above 1.4v with C-Die?