[Zag]

Don't overdo the re-thinking. You made a read at the table and you acted on it. I firmly believe that your reads will not get better unless you trust them. If you had second-guessed yourself at the table, and decided that A5 or 56 were just too unlikely, you really would have been kicking yourself when he check-raised.

Consider that this move also gave you an image that you were later able to exploit. All-in-all, I think you did the right thing, even though it may not have worked out for the best this time.