I don't know how 100nl is playing these days, but I don't remember c/r bluffs being that common place.

Hand 1 - I'd bet much more on this river, cause now I'm not even sure if your half pot bet is inducing a bluff raise or something. I'd bet $24ish and fold to a raise. As played, meh I think I'd still fold. I don't think a one pair hand is turning itself into a bluff here, so you're beat by pretty much anything and there aren't any worse two pairs raising here.

Hand 2 - This pot was crazy multiway, so a ton of hands are possible. This is a super easy fold I'd say. Your hand might as well be like pocket 7's on this board after being c/r'd. I just don't think people are running crazy bluffs in big multiway pots. Ask yourself if any hands worse than yours are raising for value. If not, then its foldddddd time.