What ddr5 speed are you running? 6000 is technically an over clock, AMD only guarantees being able to run at something like 4800 or 5200.

You may need to bump up voltages slightly for your CPU's IMC (I needed to on my ryzen 8700F to run 6000 stable). Its CPU sample dependant.

Also as other commenter pointed out, typically 4 sticks will achieve lower stable clocks

I just yanked two of the sticks out. Who knows, maybe I'll sell them. 64gb is sufficient most of the time anyway, and now I'm running at 4800 instead of 3600 and the boot is much faster. Thanks AMD!