Hey Willp,
Thanks for sharing your experiences. I 100% agree with the weight, frame rigidity, and awesome flagging. But must say I am surprised with your upwind and loading experience. Like most things in design, one aspect to advance a characteristic usually does affect another in some way, and whilst the wing definitely has a positive feel, I find it incredibly fast and easy to go upwind. I also am thinking about your hand positions, and must say I rarely have my rear hand all the way unless going for hangtime in jumps. The ADX wings love to breathe, it is easy to over sheet them accidentally and thus increase pressure but reduce performance (particularly upwind). I generally have my hands about one hand space back from the front of the handles (i.e. about 10cm), then I make slight adjustments mainly with my back hand depending on angle and pressure, often bringing it forwards, but also back a little (never really all the way back for riding).
Moving swiftly and letting the wing breathe is important, also adjusting the power angle to foil can greatly help upwind performance (bring the wing aft/back like your windsurfing). Twist your hips and open up your shoulders.
I hope time on your new NVision becomes second nature soon with a few more sessions. It is an awesome wing for sure

Ride safe,
JB