Sorry to post this, but a customer complaint can be helpful !
First of all : The Aero 8 is running perfect. Better than before.Result of yesterdays (and todays) testdrive:
Speedometer: perfect ( no more changing on /off)
Rev meter : perfect ( no more changing on /off)
Warning lights: perfect
Electric lightning: perfect (no more: key take off ... lights on ... battery empty)
Speed control : perfect ( no more absurd up and down switching gears)
"Turbo-effect " : gone
Engine dynamic: better than before,very constant characteristic.
Throttle response : directer than before.
In this time I can´t qualify the why´s but the results. I´m sure Mark Baldwin can qualify. The electronic upgrade satisfies.
Hope the negative episode is past and the confidence is coming back.
This week M&P will change the upgrade in the Aeromax.
Many thanks to Charles Morgan, Mark Baldwin,
Brian and Merz & Pabst.
Will close with :
Customer complaint is always a second chance ! Well done ! 
_______________________________
Oliver