So from my tuned 6400 gdm on to tuned gdm off I had to loosen:
Tras +1 – 31 tras is weird could've set to 126 but eh I like low numbers and 31 works. 30 causes issues.
Trrdl +2
Twtrl +1
Trfc2 +1 -might loosen more but seems good for now
Trfcsb +3 -might loosen more but seems good for now
Rdscl +1
Trtp +1
Trdrdsd+1
I have also minimised voltages so 1.3 soc is unfortunately needed here but my fclk 2133 doesn't care at all so it's fine.
I've tried for CL26 with gdm off using high voltages but my memory was not happy at all.
Also I've found that tuning with gdm off @6400 64GB greatly increases the risk of corrupted files lol I was able to fix them all as I regularly scanned throughout the tuning process. One time I logged into windows the screen flashed grey with lines everywhere😆
56.8ns not too shabby for 64GB standards was hoping for sub 56ns but that's just not possible for my setup. Latency killer was not used as my budget motherboard doesn't support such features.