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I have a suggestion: It is a whopper but it will save your neck shoulders and back. Learn to play by feel not by sight. My posture problems (discs pushing on nerves in neck and back) went by the bye when is stopped looking at my fingers. This would allow you to move the guitar body (playing with a strap) under your right arm pit pushing the fret board and neck to the centerline of you body. Learning guitar is difficult. Finding the way to spend hours and hours in one position even tougher…take many breaks. Even standing and stretching is helpful 3,4 times and hour. The last suggestion I have is start working you finger flexibility. This includes wrist, elbow, and shoulder as they all relate to your hand. Your wrist break angle can be greatly reduced in that extended position you mentioned, by changing the break angle in your fingers. Ideally you would be able to touch the pads of your fretting fingers to that first joint between the finger and the hand. This will put you on the tips of your fingers, to be sure. There is a work around for everything. Keep us posted on what you find!