hand 1 versus an unknown or relatively unknown player i just call his 3-bet
Hand 2 is kinda tough as a 7/1 peep is likely to have either a flush a flush draw a king or a set. If you were ip i think you can check the turn as your hand really isn't string enough to value bet 3 -streets As played i would fold the turn. I just don't think a 7/1 nit is bluffing here. Also from my experience when they call flop call turn then bet big on the river it's usually a big hand.