[rtrombone]

In hand 1 my default is to raise the turn and fold to a 3-bet. If he pulls a stop and go on the river I fold. If he checks the river you can make a thin value bet but it's close.

If he checks the turn I'm betting pretty much anything. I don't see why you'd check a spade.

In hand 2 if you're going to call him down shouldn't you raise the turn? This way you make an extra bet if the river is an ace or king. Against tight players I don't think it's bad to call the turn and fold the river unimproved. This is where it helps to know your opponent's W$SD% when he's the bettor.

In hand 3 my default is to raise the flop in an attempt for a free card on the turn. Fold the river unimproved; the only hands you beat are KQ, KJs and the like.

Turn raises are viewed with such suspicion that it's usually not worth running bluffs on that street. Particularly in blind defense hands.