I think the 3-bet preflop is light. The flop is too light again with the overcaller.  I think you should be giving up with some of your air. This hand seems like a good candidate. 

On the turn, I would use a larger sizing to make my river allin smaller. Once the player calls the turn, I suspect his range is relatively strong. Your perceived range is very strong in this spot. (3-bet, fire 3-way, fire K turn). He should have folded by now, since he hasn't he probably has a strong hand.