I don't think you're missing anything Steve - my EC2 is the same : fixed at 20" ...
It was originally 15.5" and could be set anywhere ... but after sent back to Tracy it is now 20" and cannot be changed.
Jeff

Hi people.

I did some tuning this morning.
But I couldn't get the staging point to change.

I reset all modes to default.
The built in default Stage Point on my EC2 seems to be ~20"

Ran engine at the desired MAP, selected Mode #7  (I was aiming at 15.5") and pressed the Store Button.
I also tried holding it for a few seconds.
Staging Point stayed at ~20".
What am I missing here?

Steve Izett