Why not continuation bet the flop? What you are doing in this hand is calling, and hoping that none of the 8 cards against you aren't one of the 2 remaining 3's. You aren't slow playing, you probably aren't trying to work out what the opponents are holding (pretty much impossible due to your lack of continuation bet), so you are just hoping you can get to the end without it being too expensive.
You lost control of the hand on the flop, you'd have found out a lot cheaper whether you were against a 3 by betting. If you think SuperSpunk was betting with nothing, then you should have re-raised him to get the other guy out of the hand.
Just my 5 cents, this is one of those hands that if i was actually playing it, i would have probably done the same as you did.