Hello cpers,
Well, first of all we can't really say much how loosely he calls with PFR, VPIP would be better for that.

But obviously with the sample size it's not even worth to take a look at it.
But about the play the problem on flop is that if we are going to 3bet there we might just scare away lot worse PPs like weak PPs. For that given reason I might even sometimes rather play it passively. But obviously it depends what kind of reads you had on him so far, if he is capable of overplaying PPs there then just 3bet and get it in right on flop.
But rather the question is if you are going to Check/Raise the turn then just 3bet it on flop and avoid him Checking behind on turn. If I am going to play it passively on flop then I'd play rather passively as well on turn. We can't exclude 4x/22 hands.
Best Regards.