$30-60 KK hand, did I fumble?

[FatLoser]

$30-60.

9handed.

I'm dealt KK UTG and I raise, UTG+1 (fishy tendencies) threebets, everyone folds to the button (former megafish who seemed to have educated himself somewhat lately) who coldcalls. I decide to just call and try to get a checkraise in later.

Flop comes J 9 8 rainbow.

I check, UTG+1 bet, button calls and I call.

Turn is a blank, a 4 or something. I check again, UTG+1 bet, button folds and I checkraise, he threebets and I call him down on a blank river.

Particularly interested in the decision not to cap preflop and instead go for a turn checkraise which I was pretty confident of getting in.

Comments?