Flush draw and a gutshot with 2 opponents is +Ev. Looks perfect to me. You can expect an UTG raise and you can rereaise for value, which you did. If it simply gets called through, that kind of sucks, but having 2 people come with when you're on a draw makes for better implied ods than raising immediately and only getting the SB to come along. I don't think you win without hitting your draw, so chasing UTG out at the flop doesn't really help.