I found my Aeron chair triggered my lower back pain. Since then I’ve moved to mostly using a standing mat and standing up as well as strengthening my core. I might try sitting on my Aeron chair after a few months of core strengthening
I've had a terrible pain in my tailbone going on a few months now. I finally relented and got one of those donut shaped memory foam pillows. 40€ for a block of foam with a hole in it is criminal, but after using it for a week now, I must admit it does help a lot.
I get some insane neck pain with these. Found I work better altering between standing and using a normal wooden chair. Not amazing sounding but it works for me.