@Markfw The reason why you are limited to 2666 RAM and crap performance on 1.0.0.1 was because that was a pre-release BIOS intentionally crippled by AMD to prevent early performance leaks (yeah, genius move that...
🙄). You need a board BIOS with AGESA 1.0.0.2 or better to even clock your RAM past 2666... and need 1.0.0.3+ for boost clocks to work correctly
So yeah, probably will be a month or so with AGESA 1.0.0.4 before most things "just work" for most people. As it is, if you are comfortable changing settings in BIOS you can get most of the way there in anything 1.0.0.2 and up. Or if you're just using typical 3200 MHz or lower RAM kits it'll probably all work on XMP settings because this memory compatibility is definitely leagues beyond Zen/+.