Either way should have the same effect, but you only really need to worry if it reverses while in forward motion with tension on the lines. If you try and hold it steady in light winds, it will often start to reverse - that's just the design/AOA of the kite and why it can reverse launch in two line mode. It's not a problem when you're in motion unless you turn too much towards the kite and stall it but even then, a quick backwards loop sorts it pretty quick.

If it continues to be a problem, and you still have a little slack on the brake lines, then make the diagonal part of the Z bridle a tad longer (a tad is roughly equivalent to 3.75mm) (humor)! Too much and you get back into 'flappy' mode.

It's sort of the opposite problem to high aspect kites - try and hold them at the edge of the window without a little brake and they'll just overfly. The Nasa's will sit overhead very nicely if you've got some breeze but if you get a lull then yeah, they can go into reverse.

Thanks John

The tendency to backfly was pretty obvious when I first flew my NS2’s way back then. Even though it manifests itself primarily when underpowered I do not consider this problem to be entirely benign since this very tendency is the main (along with too steep AOA) cause of narrowing the window. The solution is, of course, less TE pull. Too much TE pull is there likely for the benefit of bar users but is detrimental to performance and unnecessary for handles.