Reraise that big, $10-15, see where you're at and represent Ks or Qs yourself. He'll push if he's got it, fold if he has a crappy kicker or worse, and even then I have trouble laying down the 3rd nut flush, especially at these stakes.

Or you can raise big on the turn. You have Js backing you up against people with low kicker flushes and the nut straight backing you up against any aces or trips.

I wouldn't limp KJo preflop either at these stakes. To many callers fishing for a piece of the pie. Really here you're looking to see if your TPGK will hold up if you hit it on the flop, so you gotta raise it so you know callers have legit business calling and raisers aren't running low 2 pair.