hand 1: I like your line. I agree completely with you that it seems everyone insta bets river in villains shoes.
A line I often use against the loose passives at my 50NL PS games is bet turn, check behind river. The'll be folding 99- and calling all bare FD's that you'll be winning from at showdown.
I've used it for a while now and it seems a winning play.
Hand 2: Just call the turn and probably check behind all non-heart rivers, imo.