Incogni

/e/OS has official builds for the fairphones, you can re-lock the bootloader there, afaik. At least according to this: https://doc.e.foundation/devices/FP5/install

You can also buy the phone directly with /e/OS pre-installed & closed bootloader, from what I read on the fairphone website.

Why thefloat + 1 for some values? Also you’re using <, maybe try <=

In regards to the memory training: have you double-checked how much Ram your CPU actually supports, at what frequencies? For example even the 7950X3D supports only DDR5-3600 when you put more than 2 bars of ram in, leading to issues with memory training taking long/not posting/instability if you enable any form of overclocking in that scenario. I had that problem before and switching from 4 bars to two fixed everything. Just in case this might be your issue as well.