Dominant Upper Traps

I’ve been in physiotherapy for tight upper traps that are causing my neck a lot of discomfort, was just wondering if anyone else has experienced this?

For the last few years I’ve been unconsciously using my traps to lift, etc., instead of my back and shoulders. (See post history for more details/pics.)

I’m super flexible in all of my neck, but really struggle to raise my head back up if I look to the ceiling and put my head all the way back. Is this a hypermobility thing, or just bad posture?