On both my AV7 45mm / 47mm airsal they hit 400 pretty consistently. 45mm was maybe a solid 40 degrees cooler than the 47mm across the board but regardless they both were hot potatoes.
I never was able to get them to run closer to my comfort zone ( mid 300s ). I think it's just the inherit engine design of the moby that makes them always run hot. Sorta sucks but it is what it is. I think temps under 400 are only achievable with the 50cc moby life.
This is just my experience/ opinion doe.