Hello biogas,
Preflop: I'd actually raise bigger preflop vs his 3xBB raise. I'd do it 4x his raise so ~$0,60 and maybe even add while being OOP.
As played
Postflop: Guess comes really up to the opponent. But while he may easily even have worse overpairs I am going broke in 3bet pot as well. And of course on those limits they may have a lot worse hands not just sets.
Best regards.