I actually just noticed this. I just booted into Win again without locking it down and it booted with 56!! BTW, in CPU-Tweaker, I can only see one RTL. Is that normal or are the others hidden somewhere?
Too bad CPU-Tweaker won't allow timing changes to be made in Windows. Apparently it does with EVGA, Gigabyte and some other mainboards, but Asus has locked the memory parameters in BIOS.