After tens of hours of testing with anta777 absolut and y-cruncher VT3, I've finally arrived on this config for my RAM. Quite happy with this result, considering it's lowly C-Die. I think I got a very lucky bin to have achieved sub timings like this. Ran one cycle to confirm changing tRTP from 14 to 8 wasn't throwing any errors, I think I'm done for now.