Your new electric fan.... did it always have an electric fan or did you swap out the mechanical one? Is it operating at top efficiency? Does I think have a shroud to direct air flow? Thermostats do come in different temp ranges but with the Alfas I don't know. Have you just removed the T-stat and ran it open? Keep plugging, you'll find the issue sooner or later...
I had the mechanical fan before. The switch to electric fan came with the other recent changes.
Shroud is as pictured.
I haven’t just removed the thermostat and run it open. Should I try that?