You may need some more vcore to get through the htt wall. After my 8 hour session of prime ends I'll see what I can do to get higher because I have the same memory as you. I haven't set timings on the memory, they default to 9-9-9-24 and I set the voltage to 1.5 and just run them. Right now my htt is set to 270 because I'm testing for max nb with high cpu speed.