For the second hand, I like the small min-raise here, as it will freeze a habitual continuation bettor. It also allows you to gain some much needed info if the player always bets the flop about his current hand. I think the most likely holdings of this player is a pocket pair such as 77 or 88. With that tricky board its hard to call an all in after you've shown strength out of position, representing A4 or a small set you want to protect from draws. Starting around 600nl, players will start to give you credit for hands and I like the way you played this semi-bluff, though out of position it should be reserved for few occurances against aggressive flop players.

The first hand hes most likely folding QJ or 89, as there are no flush draws, which means you should come over and hammer his flop min-raise that he is using to get his draw out for cheaper. If he folds, fine you take the pot. If he calls, you have a bigger pot for the turn which means you can charge more still giving him odds for the straight and you'll take the pot two thirds of the time. If he raises your reraise on the flop, I feel its an automatic push unless he's really really tight, as the only thing you are "really" worried about is 77 and I will pay that off every time. You may not be able to destack a draw, but you will generally get more than you did out of it. Possessd is right though, there is no way for you to have a weaker hand than two pair there so you will only get called by a set or a made straight with the double gutted J9 on the river, both of which beat you.