[Kasane]

Cor, he's folding KQ. So you won't be flipping. He's folding pp's too very often if he's any good and you deny him his outs. He's calling with AK, but probably folding AQ. He's folding AJ, AT, suited Ax (which is also in his range.) He's folding a ton of stuff that you want him to fold.

I'm exactly 18% pfr and a bit laggy -- and I'm sure about this. And if you're 15/10, you're getting all sorts of folds from a sharp villain. Folds that you want.

Also, your pfr should be closer to your vpip, especially the lower your vpip. prime vpip is pretty debatable, so I'm not arguing with the 15% itself.

hope this helps.