A very nice setup! My only suggestion would be to get rid of your “executive chair” with arms and a tendency to tip too far back. Arms get in the way. A secretarial chair is much better suited to making jewelry. I believe that the way you “address” the bench is important. Not only for long term posture, but for maintaining control. Your bench pin, is the most important “tool” on your bench. Groove it, file it, saw notches etc. Sit erect, use your bench pin. Maintaining control of what your working on is in my opinion, critical for professional results.