[Hobbs.]

you want to fold preflop? I'm 3-betting this a lot of the time against that guy. Anyway, since you called preflop you have the best hand on the flop a lot of the time (go input top 35% of hands into pokerstove to get and idea of what this guy's hand range might be). I will often c/r the flop, but calling is fine too. I'm torn on the turn, but I think donk betting the turn and calling down if raised is probably best, although a case can be made for c/r'ing.

Anyway, the moral of the story here is that against a CO openraise from an aggresive player AJ is a much better hand then you are giving credit for. It will often have SD value UI and very often will dominate other ace hands.