Hmm... I just tried playing sitting down, on both right leg and left (classical style.) It seems I shift positions of the neck depending on position. If I'm playing near the nut the neck is up close to my face for example, in fact I seem to shift the guitar from left/right legs while playing the different registers... and I don't seem to feel any discomfort. Have you tried wearing the guitar on a strap when playing seated? I mean set up short so it's still hanging while sitting.