You mention an issue with the airbox on your Aeromax. Not sure how relevant the following is to your problem.
I have an Aero 8 S4 and mentioned the following to the factory when they were doing my first service which was carried out at my request pre-delivery. I have always felt cars with electronic throttles have a very poor and non linear response (initial delay then sharp takeoff). My current RS6 is a good example of that problem.
The Morgan answer to this was to 'open up' the airbox to allow better breathing and in that way improve throttle response. Not sure what exactly was involved but it works!
Kind Regards,
Robert
