Hand 1:
Pre Flop - I really don't like the raise PF out of position against a villain that we know can call with ATC. Your hand isn't strong enough.
Flop - Either check or bet harder, around half the pot. Personally I prefer the check because a free card here really shouldn't harm you and the chances are he hasn't connected with the flop.
Turn - Make this bet closer to 0.8, you're giving him pretty good odds to draw to a flush.
River - good

Hand 2:
Pre Flop - Not generally the line I like to take but at least you raised it enough.
Flop - Good, you've varied how you bet your big hands, hopefully he's observant and remembers last time you flopped a big hand you pussy bet it.
Turn - Out of position I'd bet half the pot, about $2. The check in position isn't bad though as it controls the pot, only problem is if another diamond falls on the river. Still, with so few outs if he has something like Ad7x I'd be willing to take my chances.
River - Standard call imo

Hand 3:
Pre Flop - Make it 0.4 again
Flop - I don't like the overbet of the pot, you have a pretty strong hand at the moment, no need to chase action away. I'd bet just under the pot, maybe 0.7.
Turn - I'd bet about $2.25
River - Nice check

Hand 4:
Pre flop - Raise to 0.3, you have a strong hand to take the BB on with.
Flop - Good
Turn - I don't like the call purely because he doesn't raise a lot so your implied odds aren't great.
River - Good