ALRIGHT *cracks knuckles* LETS GET IT ON
ALL of your weak shots are when the subject isnt looking at you, there are a few shots that work when the subject isnt engaging you, but in general i think youre more successful when you have a more direct connection with the people you photograph like you said.
I also notice that you get better shots when you follow the light, and I dont mean that in the stereotypical way. What i mean is that when your frame has a good source of light you find more interesting compositions such as this:
You 'work for it' more when there is good light involved. Where the subject isnt necessarily properly exposed it works. 'starry eyed surprisse' is what comes to mind.
also, experiment! dont be afraid to push the subject with the frame. You control the gravity of the frame and setting things off kilter instead of keeping the subject dead center can give you alot of different feelings for the scene at hand.