Preflop I'd raise more, $2 is kind of smallish. He might not have stuck around for $3-$4. From the other side of the coin, I've gotten burned this way when I had KQs or something and Mr AA or KK just calls my $1-$2 raise, then I get burned with a flop like Kxx rainbow(where x's are not the same). Overall I'd still bet more preflop, though

On the flop $6 was fine. Couldn't have read having an 8, but I wouldn't have gone $30 with that after the turn. With a rainbow flop, a half-pot bet would've given you the same info. If he's all-in there, you fold(IMO)