Hand 1: He could very well have flopped trips or a flush himself. Makes sense for him to call your raise with suited cards from the BB or a pair. He could have been slowplaying the flop and trying to trap on the turn with his set or a flush himself. I would value bet the river for $300

Hand 2: I like how you handled this hand. I would have called it down. Only hand youre worried about is flopped trips or a flush.