[Ignatius]

> I was dealt AA in MP. It was checked to me and I raised to $4.
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If you were sure to routinely get callers with this huge 2.5x pot overbet, then there's nothing wrong with it. But then, you also need to make these bets with other hands too.
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> Flop was J83 rainbow. I bet $8, still 2 callers.
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With more than $12 in the pot and $22 left, I'd simply move in here. By only betting 2/3 pot while being committed for another $14 you give T9 proper implied odds to call and a 5-outer with a pair almost proper odds to overcall (schooling effect).
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If you have to trap here - usually not a good idea with just an overpair in a multiway pot - then bet 1/2 of your remaining stack now and the rest on turn. This way, you keep the implied odds roughly constant over both betting rounds.