>Can you please advise me on the best course of action I should
>take?
Move to Florida. This may seem absurd, but reality is that the best way for you to show the court of your genuine desire to act in the child's best interests is to live in the immediate proximity of the other parent, so that both of you can try to act in the child's best interests on a daily basis.
Of course, you have a new life and a new family, etc., so moving is not really an option. So, you must balance the costs and benefits in your life to come to a rational decision.
Unless you can show that the other parent is clearly unfit to parent, you are not going to improve your parenting arrangement in any substantial way, so don't waste your money trying. I would suggest that you offer to engage a private mediator and sit down and discuss what will work for both of you -- and I suggest that you recognize that you are not in a very strong bargaining position unless you move to Florida.
Mediation is always a give and take -- no one gets what he/she wants.
If the other parent refuses to negotiate anything, then you should simply ask the court to make your visitation/custody arrangements as definite and certain as possible so that there will be no fudging by the other parent.
However, you must also realize that the child doesn't know you all that well at this point, and he won't be inclined to want to visit you, as he grows older and develops personal friendships. So, you may find yourself being quite literally, "Disneyworld Mom," if you understand my meaning.
That's about all I can suggest. Your history is what it is. I doubt that it will be particularly relevant at this point. But, the other parent will not be severely punished for choosing a bad spouse, if that spouse is being punished by the criminal justice system, because that spouse will be out of the picture.
If that's not the case, then your entire case, should you choose to fight, will be all about the danger of the spouse to the child as being the rationale for why you should be awarded custody.
Only, you're in AZ, so the court could just as easily decide that foster care in FL is to be preferred, so as to maintain the child in his environ. And, by the time the court makes that decision, you will have paid out a small fortune in legal and custody evaluation fees -- just so that you can pay a foster parent to keep the child in his current school with his current friends.
Lots of tough decisions -- only you can make them. Wish I could be more decisive, but your case is extremely complicated, based on your posted facts -- so I would be extremely suspect of anyone who gives you a cut and dried analysis.