I agree with Emil Moe here. There is not going to be a "perfect chair that solves all back problems" just like there is no perfect operating system that never crashes and is 100% secure. I like chairs where I can lean bar far so that way I have options on different postures throughout the day, rather than a chair that locks me into one posture the entire day.
In fact, I would argue that sitting in general, or standing, in 1 position for any length of time over 30 mins to an hour is itself the problem. For this reason, what I do is try to MOVE as much as possible. Change posture, change position, sometimes change mice and keyboards (I have several different types of each), take stretch breaks, wrok out, etc...
For me, it requires ALL OF THAT to fight off back pain and fatigue and even still, sometimes it catches up to me. I HIGHLY RECOMMEND getting yourself a high-density foam roller and 3-4 times daily, rolling your back out on it with special focus on your lats and where they connect to your lower back. You can also get a massage ball and push it into your back against the wall or floor.