Got it running! Thanks so much for the help!
The fix was to turn immersion mode on, which is what "disables" the fans. They still run, but I guess it stops trying to make sure theyare there? And then I tuned to 800w with that setting turned on.
Going to go through and test tuning at different w next to find what setting has the best efficiency under 1200w.
Again, thanks for the help!