KTs flush draw

What hands will he fold after he x/called on the flop? QKs,QJs,QTs and basically thats it. He may not even fold a KK here. So if you are not planning to go AI on the river I would check behind the turn

Just fold this PF, it is not worth playing a highly vulnerable hand like KTs in a 3bet vs SB spot, you put a lot of money into a pot that you will often be in an uncomfortable situation. Think, if the board comes K2397 or T7325 and the villain triple barrel gets you in an awkward situation, do not get into it.

Folding this hand pre-flop is normally the correct play. But you had position and you can represent a lot more hands than your opponent, so the call is not that bad.

You flopped a royal-flush draw, on a board that favors the villain. I would've preferred to check-behind here. It doesn't make a lot of sense to bet. It's highly probable you'll get called ou even raised, so just take the opportunity to see a free card.

The turn completes a straight-draw, but that hand doesn't fit the way the villain played the hand. He checks for the second time and you can consider making a small to medium bet here to steal the pot on a semi-bluff move. If he calls, be prepared to fold the river if you don't hit your draw, because this is not a good spot to bluff. Check-behind again is also a possibility, but I believe that a bet here is usually the best option if you checked the flop.

The river completes the flush. Your bet size here is completely ridiculous. You have the best possible hand on that board, so you want to go for value. A huge overbet here makes zero sense.
With the correct size you could make AA, QQ to call you or even better: to raise you.

Looks okay, hard to missplay so much equity
My standard play is to check back everything or go small like 25-33% and then bomb the turn in these boards

But with how strong your draw is this it's not a big deal

Defend pre is ok, sometimes you have best hand when he 3bets suited connectors and some broadways like JT or QT. If I bet flop I bet higher amount, i do bet big the turn. We still got nothing and we would like him to fold small aces or hands like JJ/KK. When we made river we have to bet the amount he can call with range mentioned above.

Pre: People tend to fold and criticize such 3bet calls, I personally put myself alot into this position with such hands, I like it even more if I have some notes and info of villains post flop plays, the only reason to make me fold pre is if I knew my opponent was a solid reg.
Flop: I'd go for 2/3 of the pot, unless you hit your draw on the turn, your equity will be cut in half, plus if you hit your draw on the turn the pot will be bigger, making it easier to put money in, and if your oponent folds we win it right away.
Turn: Our equity got cut in half and our opponent is most likely to have an A which he is most likely not folding, trying to make villains fold A's on such spots can become very expensive, plus if you get check/shoved you put yourself on a really crappy spot.
River: I'd pot if I hit, fold if I miss, depending on my opponent, if it was a weak player I could overbet.