Since the engine can run leaner with the Solenoid than is possible with only a NVA, it should be possile to tune to "perfect" on the NVA, and then activate the solenoid at somewhere in the neighbourhood of 90% duty cycle or so, and the engine should basically remain running exactly as well as it did on the NVA alone, because the improved evaporation should cancle out the reduced fuel supply. The difference in the nozzle pattern should be visible as if flipping a switch, and in 2-strokes the exhaust should go from a blue hue to clear and invisible likewise. A simple unplugging/plugging in of the solenoid driver, with the throttle af full and the fuel curve set at the proper value allready should do the trick...

Those are interesting things to observe and greatly help to understand how things work.
Everyody benefits by better understanding, and who knows what possible bright epiphanies result from it. I mean, Dave came up with the atmospheric correction, you came up with the EFI carb, who knows what the next reader will bring in?