All those limpers on a board like that... if I'm up against AJ, I'm broke anyway. If they have a flush draw they're not likely to fold it since it's probably a gut-shot as well.
Yes, we went the flush draw to come along of course, so you raise, and make them make a mistake. If you do as you did and give a cheap turn card to a potential flush draw, you are the one making a catatrophic mistake.