Personally, I bet 3.50 about 80% of the time there. You show agression on the flop and get callers. Turn comes and you stop all of a sudden. Looks too fishy to me, then again this is SSHE and people don't really care about your line, they just want their pair of aces lol. But I don't see what hand calls your flop raise and folds to a 3.50 on the turn.

BUILD THE POT UP BABAY!