Wow. That is a pretty crazy setup. I would worry about neck problems with the position of the top row. How long have you worked with this setup? Also what make/model/spec is the laptop you run it all from?
1) Have set my chair so that it rocks as far back as possible with little force.
2) Sit directly across from the gym and try to visit it twice a day for at least two 15 minute HIIT cardio / body weight workout. I do lots of pull-ups, archers, and have been working up to the iron cross.
3) Only use the upper deck monitors for security reviews where I need "eyes on" resulting actions. I don't use them on a daily basis.