With your stack pre, I don't necessarily hate the open, however pretend you are opening pocket 6s vs a suited ace.  The odds of flopping a flush draw is about the same as flopping a set.  If you don't flop a set with a middle pair, you wouldn't compound it with c betting multiway right?  However, if you connect with the flop (by flopping the nut flush draw) then I am prepared to go with it, however on the same note, it is easy to get away from (when missing).  When flopping an ace don't fall in love with it.  I would rather c/c with the flopped ace for pot control and reevalute the turn.  By c/c the flop you may improve your hand with the bd flush and straight draw.  By c betting multi way you are bloating the pot. 

With the way played though, I think you can get the same information by c betting about 1/3 pot then 1/2 pot so if called you keep the pot small (while gathering information) and can improve on the turn, where now it is cheaper to double barrel.  I think you will get all the information you need by seeing how the villains play post.  By opening utg aces are definitely in your range and if they miss they are going to proceed cautiously as well.  Best of luck at the tables!