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Preflop: Raise it up. No doubt about it. You WANT to build big pots with your strongest hands!

Flop and turn were played well. You raised hoping the initial PFR would face the field with 2-bets cold. BB took care of that part for you, apparently.

River: With four-to-straight out there, I also would check-call this (unless it was 2-bets or more to me).

BB is unlikely to have KT because of his actions on the flop. He's also unlikely to have JJ because of his pre-flop and flop actions. AX would make sense.

Well, it turned out UTG+1 made a really weird play when he showed [9c]. BB showed [2d]. This goes to show that you can't trust PokerOffice too much I guess. Just because someone is rated TAG over 40+ hands, doesn't mean he knows how to play. Or maybe he's on tilt. Or maybe he's an exceptionally card-dead LAG.

You made a really good analysis as always, EP9, in pointing out some stuff that I had missed.