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Adultery is a crime (class 3 misdemeanor) under Arizona law. Here's the statute: http://law.justia.com/codes/arizona/2005/title13/01408.html. However, the statue of limitations to charge a person with adultery is 1 year from the event. Thus, the statute of limitations has long since expired for filing any charges against your ex-wife for adultery.
However, if you have overpaid child support, you do have a right to file another motion to modify your support amount and also seek either a credit or reimbursement for any overpayments that you have made. You would have to file a motion with the court and prove that you have paid more than you should have, and if you can do that, the judge can order a credit or refund to you.