I have this same issue. I've never seen a chair that supports shoulders back and down good posture. They all seem to hunch or arch forward. None offer the mid b

I have this same issue. I've never seen a chair that supports shoulders back and down good posture. They all seem to hunch or arch forward. None offer the mid back support needed to put your chest forward. Same situation for sitting cross legged. My solution for posture has been a standing desk. I never really made any progress on my posture until I started standing.