line input doesn’t work on a Ryzen Hack using AppleALC period, (The Acidanthera Crew don't support us AMD boys to add support to it unless somebody gives them the fix already done basically) An External DAC is always the better way togo.
The only thing I use my internal audio is for sound alarts.
If you have windows installed Bring up HWINFO and run some tests via benchmarks and watch your cpu freq, temps, power draw and keep an eye out for Hw errors and make sure all is ok on that side of life.
I think those coolers that AMD supply are just awful and would never use one on anything over 6 cores as the temps always fly way to high for my liking.
What motherboard are you using and have you flashed it up to the latest firmware revision?
Problem is though a lot of your cpu readings look...