I have previously tested an Aurora2 -12m and found that with hydrofoil it was unstable at the edge of the window and prone to front-stalling/luffing and collapsing. I did long mixer test and measured the A,B,C,Z levels and found that the shape was very unusual (on a new kite) so I decided to try and shorten B level to make the kite more stable. It worked, but I went too far (4cm) and the kite was "stally" and slow but stable, so I changed it back to 2cm shorter (with a knot/loop) at B mixer level and tested it and it was great! In the video you can see I rode on my race bar/lines so very short lines (12m) but the kite still flew well. Also the wind was light (11kn) at start of session so with short lines and small board it was tricky but I got it going nicely. Later in the session the wind picked up and got gusty (about 15-17kn plus gusts) and you can see the kite gets a little unstable, but nothing that can't be managed with some rear line pressure. My conclusion with this kite is that it has some stalling and collapsing issues the way it comes from factory but it can be modified to fly quite well. When riding with a twin tip there is so much line pressure that i think the stability issues aren't even a problem and also you are riding the kite in much stronger winds. With a hydrofoil in lighter winds and particularly gusty winds the kite is a little unstable, but much better after this mod, and I would say in this state (and ideally with longer lines) the kite is usable and actually quite fun.
As a side note, yes I rode with lines that are too short but I still had a good session. You can see that when I tack and the lines twist the kite stops making power and sometimes the tips fold, yes this is due to lines too short, next time I'll fly it on longer lines, but using my normal bar and lines is good practice for kite racing anyway so I can deal with that, but not having any lift in tacks is annoying.