BA- Some of the office chairs have knobs and levers to make adjustments. See if you have any that will stiffen the back so it isn’t so loose.

I would also like to recommend if you haven't already obtained one. No matter what chair you get put one of this floor protectors under it. we have a hard wood floor and a carpeted floor and the chairs just move so much better. My chair is one my daughter didn't want anymore. She used to have a desk in her apartment, but she moved and just uses her table. (She said she sits at a desk long enough at work so didn't want to come home and do some more.)

I purchased a Bernina sewing chair. At 5'2", I found that the depth of the seat (18.5") was too deep for me to comfortably sit with my back up against the back of the chair and my feet flat on the floor. This was causing me lower back pain. At a quilt show, I purchased another brand (I think it is Koala). The seat depth on this chair is 16 1/4". It has made the world of difference. I can sew for longer stretches without back pain.

Perhaps you can measure the seat depth of a chair that is comfortable for you to sit in and have your back up against the back of the chair while having your feet flat on the floor. Then, look at the measurements of the chairs you are considering, if you are not actually able to take the chair for a test drive.