Flopping a set: slow playing or not?

[Spurious]

First Hand, i wouldnt say its a bad move checking, since you want to force out people. UTG could easily have a hand like 2 Highcards, so this flop might have helped him.
Turn check is stupid, on the Turn its time to get the money in.
Second Hand: The SB shows you that he got a hand. Dont just call, if someone behind you got a gutshot or OESD you need to force him out. Definite raise on the Turn, what are you waiting for?

Third Hand: Raise if someone bets into you. If he's bluffing, he wont call you on fourth street either, so why not raise, he might have to overcards but then he will call your raise, i guess. You need to get your money in on fourth and fifth street!!!

Remeber: If you dont lose a lot with a set, you probably played it wrong!