Maybe it has something to do with how much of a load the engine is under on the ground vs. in flight. Anyway, I'm on the right track .

Brian;

I noticed the same thing – slight difference.  When tuned on the ground there would be just a missed beat at the stage point in the air.  It would certainly get my attention until I realized what it was.  Tuning in flight made it go away, and staging is seamless.  It makes some sense – there is a different rpm vs Map relationship when in flight.

Looks like I’ll be back out doing some re-tuning when the weather clears.  I thought I was done with all that some years ago; but things change.

Al G