@carusoam
Yes, so many variables with a carburetor.........
@DXB
I can't image not being able to use the entire RPM range in cruise due to CHT temps. Really strange....
Revisiting the picture below, do you have a upper baffle rubber seal across the entire cowl opening? I'm not sure if the doghouse design changed in the later years, but on mine a rubber seal hides all the sheet metal showing in your picture. Without the seal on mine, incoming air would route above the doghouse.
PS. We could start a whole new (4th or 5th) thread regarding TAS...haha
TC