I'm not a big fan of pushing, honestly. I'd have raised less preflop (probably 1800) with the Q3, then raised (not pushed) on either the flop or the turn.

Given your read, the A6 hand was acceptably played. Again though, I'm not a fan of getting all the chips in preflop if he's likely to fold.

HOH2 = Harrington on Hold'em volume 2 - The Endgame. Good book.