If things are good in Virginia, I think I'd save a bit of money, get decent legal counsel in Florida and drag your ex- back into court in another courtroom from the one run by her pet goons and get a different setup going. Save up evidence of mistakes by the Court/System in collecting your money and incorrectly jailing you, your additional children requiring support, lower wages, etc. You can inconvenience your ex- as well as she has you. I'd at least try it.

Leave "worries" about the future/college, etc. to when they're appropriate. The US has free and scholarship programs for college too and many kids these days pay their way through anyway while working. Kids grow up and then it's a total non-issue; moving now might waste lots of opportunity to interact and be with your son and frustrate you further; move in 10 years after he's grown and can do as he wishes and you can help him then as you like, it will go by in a flash.