Added the jsaux backplate and stuck a 40mm heat sink on the plate to help with passive cooling, not sure how much it helps but the fan is quieter so I’m happy with it!
Formal testing no, I could tell the case plate would get hot and my understanding is when the thermal mass stabilizes at a temp the fan would run as normal, so this adds a bit more mass but in a way that’s easier for the heat to passively dissipate