PO, in a typical low buy-in SNG I definitely don't think we're folding out better by 3-betting. Honestly I don't think 99+, AQ+ is an unreasonable 4-bet range for normal bad opponents. If he just flats (which happens more than one would think) we has a pot-sized bet to throw at a good flop, which will happen the majority of the time.
Another thing to consider is that raise/calling or raise/shoving most flops is probably the easiest way to play the hand. If you're playing multiple tables looking for a play that is both +$EV and easy to perform is going to be your best option. By flatting, we have to consider if we're playing our hand for purely set value (I would assume not), how to get away if we think villain has on overpair, how to get to a cheap showdown if the flop come A high, etc... Requires a lot of time and thought, which hurts hourly. OP may not multitable, so this may not apply, but just some food for thought.