Hand 3 is the only hand worth betting turn for value.

Hand 1: 8x isnt calling your flop bet, and few 8x's are likely to be in the hand short of a read that villian is calling extremely wide. You're up against a FD, Kx, or a slowplayed set. You need to find at least one check behind either on flop or turn. Start to think more about what ranges villian has based on his PF play and his flop play.

Hand 2: I dont really think you're representing anything on this river, it looks like the bluff it is. At these micro-stakes you're really better off betting value rather than bluffing. Look at it this way, if villian has nothing you already have him beat, and if he has something he's almost certain to call (because thats what they do). A river bluff here is rarely a good plan with the line you've taken.

Hand 3 is a bit more difficult. HU is a whole different kettle of fish. His range is definately wider to call PF here. I like flop, I like turn (TP is a much stronger hand HU than in 6-max/FR), river I think as others have said, make a 1/3 pot blocking bet or something, but this was the best played hand of the three.