hello lcoff!
i have nearly exact the same setup as you (same RAM, GPU, Wifi+BT, only difference: my CPU is i9 10900K and I use Evo 970 SSD) and i wonder why you are able to boot so quick!
My board takes 25 seconds from opencore to login-screen and its stuck for about 3 seconds on something about USB "missing required descriptor" or "power supply unavailable: assuming successful power". the rest of the 25 seconds are just running text, not stopping or waiting anywhere...
I am really interested in your BIOS-Settings if you have anything special and I want to ask which method you use for USB (because that seems to slow down my boot a bit).
Do you use the latest BIOS? have you flashed the thunderbolt-chip or is it original?
How long does your board take from power on to BIOS / Opencore?
Would it be possible to get your BIOS-profile and your EFI so I could test if my boot-speed changes with exactly your setup?