Update:
After reviewing some of their YouTube videos, I shopped over a BTOD (Behind the Office Door) where they refurbish and sell used premium office chairs. I bought a refurbished Steelcase Leap V2 for over $600. That was really stretching my budget, but I had to move forward. The difference between this chair and that miserable old wooden barstool is immense. Now I will have the freedom to move forward with more changes to clean up and improve my office space. I am now looking into WFH ("work from home") options. The "new" Steelcase chair is excellent, although a bit of a pain to assemble. I guess this means I'm closing out this old thread. If I want to discuss office chairs, this Steelcase, or other WFH topics, I'll start up new discussions for them.