[bbartlog]

Preflop seems fine to me. I mean I guess if the game is very aggressive preflop you could limp and then 3-bet, and maybe you would have gotten another caller, but I doubt it would really have made a difference here.
Depending on MP1's preflop 3-betting range, I think you could bet or raise the turn. Since I would normally expect someone to have AAxx, Awwx, or A2PP here (and AAxx is no longer possible on the flop), it just seems more likely that he's betting A23x than A6xx on the flop, and in that case you probably are ahead for high. But I guess since he capped the flop maybe I would have checked as well.