Without getting involved in the science behind it, I have long since noticed that the aircraft wants to increase its bank angle at higher AOB, needing a small corrective aileron input, but shows no distinct tendency at lower AOB. Specific thresholds I have no idea of, but circa 28deg seems about right. One thing I can say with absolute certainty is that at low AOB, it is more stable than the Classic, but only in zero-winds; as soon as you get the lightest winds or turbulence, it's much less stable than the older variants. I assume it has a much lighter wing loading, and the tail empennages are much bigger, so the larger sail areas are the likely causes. Winglets don't seem to affect stability, they just make x-wind landings a bit trickier because they increase float in the flare while also increasing side sail area. I wouldn't say the NG was especially stable - it needs a lot of corrective inputs when flown manually, especially in even slightly windy conditions.