I think it's a lot harder to steal pots/bluff in the lower level stakes and I believe you already know why as well. They will call with practically anytime they get a piece of the flop. My only advice is that if you want to steal a pot, learn when you can. It seems like you're making a lot of good decisions right now and are aware of the danger at your level. My advice is reads. Know your ooponents, know who the tight players are who will check when missing and fold to any bet. These are the players you want to be stealing from.