People do the dumbest shit in the world at these tables. It's tough to put people on hands at 1/2 penny tables. In the first hand since you raised him preflop and he called, when 3 tens come out in a heads up situation I feel it's pretty safe to say that they don't have it. If they do then it's their lucky day and they can take your 3 dollars, but I think you definitely need to not slow down the aggression on the river.

The second hand I can see your reluctance to bet with the ace, after all, in micro limit games your opponent usually has the ace. If he had the ace though, I don't feel like he would try to check-raise you on the turn and the river. If i didn't bet the turn I would have certainly bet the river.