Airplane analogy is great, if you're a plane geek
too many hours playing flight sims, me...
Base-line your bar & lines - most important thing you can do to trim it - then go out with the kite.
IMO best to do this in the bottom half of the kite's wind range... when you can just ride upwind if you don't mess around, but can stall the kite a bit if you sheet in and hold it.
If you can ride and hold a nice straight tack, start playing with bar position. You'll feel the position where the pressure builds and the kite pulls the best, and if you keep pulling more the pressure keeps increasing but the kite doesn't make anymore power, or back-stalls.
Now, trim the (gnnn!) depower system so that you can hold a good stance, with the bar making full power (best lift/drag ratio?) in whatever position you find comfortable. Now your kite's trimmed
If you got short arms, it might be right on the QR. For me it's usually an inch or two above...