I cbet that flop almost always.

That turn card changed nothing on a fairly dry board. I'd say he mostly has a made hand of some kind and probably isn't folding the turn. You may fold out pairs under a 9 but that's about it.

A king would be a good card to double barrel. You want the card to have changed something that would make their hand ranges (that call flop) feel weaker.

__________________
For Free Money, Rakeback and some 6x Ongame bonuses, I recommend PokerSource.

I recommend Cardrunners for superb poker coaching. It was honestly the single biggest improvement in my game signing up there! Sign-up fee might seem steep, but it pays itself back within weeks.