Alright, so I an interesting hand I need some advice on.

Winning Poker Network (Yatahay) - $0.02 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

CO: 200 BB
BTN: 59.5 BB
Hero (SB): 99 BB
BB: 61.5 BB)
UTG: 109.5 BB

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has K 8

fold, fold, BTN calls 1 BB, Hero raises to 3.5 BB, BB calls 2.5 BB, BTN calls 2.5 BB

Flop: (10.5 BB, 3 players) 4 T 9
Hero bets 6 BB, BB calls 6 BB, fold

Turn: (22.5 BB, 2 players) A
Hero checks, BB bets 9 BB, Hero calls 9 BB

River: (40.5 BB, 2 players) 7
Hero checks, BB bets 21 BB, Hero raises to 80.5 BB and is all-in, fold

Hero wins 78.5 BB

1 BB was deducted from the pot for the jackpot.
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Okay, so this hand is interesting because of my decision to slowplay the nut flush after it comes in on the turn.

Let me explain my reasoning. If I bet or check/raise turn, I expect to get called by worse flushes and occasionally a set or 2P. If I check, I expect Villain to bet all of his worse flushes (as we are underrepped), and also some bluffs. In this situation, by check/calling, I am getting Villain to put money in the pot with hands he otherwise would not (the bluffs). And, while I may miss out on value from sets, I don't think Villain will have many here. This is because I would mainly expect those hands to either 3b pre or raise the flop in a multiway pot.

On the river, I expect Villain to continue with some bluffs if I check to him. I also expect him to bet all his worse flushes. Basically the same situation as the river; the advantage to checking is that he will put money in with bluffs, the disadvantage is that he could check back sets/2P.

One last thing: if Villain checks back sets/2P on the turn, I think I can lead river and get those hands to call. In this case, I don't expect to lose to much value, as I think I would probably only get one street of value from those hands anyway.

With everything I said above, I obviously decided to go for the slowplay. So what do you guys think? Do you agree with my reasoning? If not, why? Thanks!

If you're in a flush over flush spot the money will get in one way or another. By check calling the turn and checking the river you gave your opponent the opportunity to fire with bluffs and bet fold with stronger non flush hands. Sometimes they will check back their medium strength hands on the river and you lose value. Not enough players at lower limits bet thin enough so it's always a risk.

You're also not likely to get three streets from medium strength hands so the line you chose works well vs bluffs and hands like 2 pair, straigjts etc. that will probably fire the turn and river if they detect weakness. Looks like you got max value out of your flush.

Just bet your strong hands and get called by worse hands that villains at these levels cannot fold (which is many hands).

If you really think that sets and 2ps are only occasionally calling then you should be betting every time the third card of a suit comes out. If I were BB I wouldn't consider flushes a big part of your range at all...looks like a pretty standard turn CB when an ace hits to me

Do you have reads on BB? I think you're overethinking this otherwise. Id just bet 18bb on turn and put him in at river.