Note that that board has no easy UEFI setting for SoC voltage or LLC, although I'm not overclocking the CPU cores on those machines.
I think I've tried every trick in the book. Manually entering timings, upping SoC and memory voltage, LLC experimentation, fiddling with the more advanced settings, tried various BIOS etc. Still doesn't work above 2400. I've all but thrown in the towel and gotten a different known good kit, but I'm a little peeved at current DRAM pricing. For the time being as long as it work reliably, I'm good with 2400MHz. I can always change the kit when prices fall again.
I will just say apart from that, my Ryzen system has been 100% stable and reliable at stock speeds, so this in no way detracts from my opinion of the platform itself. It
is technically overclocking, and that's never guaranteed to work.