I think it was the batteries..? I don't know for sure but charging fixed the problem.
I'm going through a bunch of the settings now and ran the fan calibration and it just tells me that my cooling system is insufficient, nice. I switched the momentary switch setting to toggle, and cranked up the charging current to the max. I also changed the LED to Addressable type B, but it still isn't working. Let me know if there is anything else I should change for a basic Ashida.
I'm scared to load a game with it telling me "Your cooling system is insufficient" but I was able to successfully boot into Super Mario Sunshine and confirm audio is working! Temperatures seem to only climb and it gets upto 55C within 3-4 minutes. To my knowledge, I screwed the Wii down as much as I could and I believe it is making contact with the thermal pads (the blue things right?).
Also seems like my batteries are not keeping a charge too well, but I haven't yet charged them to full. Would it be a good idea to charge them through the PMS overnight?