Had an interesting day today. Quite helpful working at home as can make the odd BIOS a tweak now and then and leave memtest to it 
Turns out too many volts was holding me back. I was 1.45v RAM and 1.175v SOC. Stable only at 14-14-14-14-38 with 56 tRC and 350 tRFC.
Dropping to 1.4v and 1.125v I’m now 400% HCI stable at 14-14-14-28 with 46 tRC and 270 tRFC which is a considerable gain.
No idea if properly stable and needs cycling as doubtless F9 hell remains but interesting nonetheless!

Turns out too many volts was holding me back. I was 1.45v RAM and 1.175v SOC. Stable only at 14-14-14-14-38 with 56 tRC and 350 tRFC.
Dropping to 1.4v and 1.125v I’m now 400% HCI stable at 14-14-14-28 with 46 tRC and 270 tRFC which is a considerable gain.
No idea if properly stable and needs cycling as doubtless F9 hell remains but interesting nonetheless!