Hand 7: anything you are afraid of giving a free card to? Limping A-x is pretty standard for weaker players, and again since there is more than one player in the pot i feel a c-bet can be avoided.

Hand 8: If he has been floating your c-bets a lot and you actually have a hand i would make a larger river bet. Villan will likely see your large river bet as another attempt by you to steal the pot. I would make the bet close to pot size. He isn't calling $54 with air and folding to $80. Likewise i feel villan will call $54 with A-x and also call $80.

Hand 8(2): completely standard.

Hand 10: I would fold this in the heat of the moment. Most weak players will continue to c/c with a hand like MP or TPNK if that is what they have done the rest of the hand. The fact that he came to life on the river on a card that seems to be a blank is concering to me, particularly since there is really only the straight draw he could be chasing. IMO at least more than 75% of the time this river bet by villan is a hand that is better than yours so i would fold.