I have something in my lower back (moderate left leg sciatica that comes and goes on a daily basis) they can't figure out really (if you ask the doctors questions to cut through what they do when they don't know....which is blow smoke). I've done some research and the one thing I know is a lot of back issues are very complex and not understood well.
So, you have to figure out for yourself which bodily positions are good for your back and which are not and what support is best, etc.
Sitting in a relaxed fashion without strong back support keeping the s bend in your lower back greatly increases the pressure on your discs. One common reason is that this position allows your spinal erector and other associated muscles to relax, which allows your weight to shift onto the discs rather than being held by the muscle.
As such, for me personally, I am much better off standing/leaning and even moving around a bit. I find that leaning at a slight angle with no back band and excellent posture (keep watching myself and do not allow myself to slump) is the most comfortable position for me. This is similar to leaning your butt back against a kitchen counter at a minor angle. Therefore, a 2 panel is wasted on me and I just need the most comfortable leaning saddle (which for me is a 1 panel with expansion pleat). I sit a few times in a day of hunting, stand up totally on my Predator a few times, and shift a little bit...but vast majority of time is leaning.
I might be able to figure out how to use a back band to keep that s bend in the lower back, but so far it isn't working as well as what I described above.
That is a long winded way to say: listen to everyone here but you're gonna have to pay attention to your own body and try several things out until you find what works for you.