[KaiShin]

I don't get this at all. You need to be throwing chips in this pot like they were on fire.

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I check-called up till the turn because I was afraid UTG had AA

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There's two aces out there, one in your hand and one on the board. What are the chances that your opponent has AA?

I would likely CR the flop, then go into calldown mode if 3-bet.

I'd also 3-bet the river. Not a lot of people cap with AJ. You're probably splitting the pot.