Hands like this make me wonder if it is worth it in the long run to slow play anything but the absolute Nuts. Or should someone only slow play the absolute nuts. I dont know, but I would like to get some opinions about this hand.
Villian "Mr Poker" had been stealing quite a few pots. Just constantly raising after a few Limpers. I Limped in then called his raise figuring he was just trying to make another steal. He had made this exact same play quite a few times. I called with just KQo (thinking he may have nothing) and I planned to play it real careful unless I flopped at least 2 pair.

I flopped a Str8. He raised, I just called planning to slow play. Since Villian was aggresive. I knew he would do the betting for me and if I raised there would be a good chance he would Fold. I wasnt to worried about the Flush draw. I didnt he would have bet a Flush Draw that much. The feeling I had was that he was trying to steal another pot. I put him on a medium PP or AJs-AK.

Another Spade on the Turn. Villian moves all in. Like I said I was pretty sure he didnt have a Flush. He shows AsK. I was right about his hand. He catches the 4th Spade on the River and wins.

I know that if I would have moved All In on the Flop he would have probably Folded. But by Slow playing I had a good chance to double up. I would like to get some other peoples opinions on how they would have played this hand. Was it just a bad time to slow play. Or just and unlucky hande?

Thanks in advance.

Seat 1: knightfrost (1,985)
Seat 3: 3rd bullet (715)
Seat 4: PETET16 (1,405)
Seat 5: Samual A Carver (2,410)
Seat 6: JCullen757 (2,885)
Seat 7: Mr Poker 3rd (3,780)
Seat 8: Looterman77 (1,535)
Seat 9: TheDeadHand (1,205)
Mr Poker 3rd posts the small blind of 30
Looterman77 posts the big blind of 60
The button is in seat #6
*** HOLE CARDS ***
Dealt to Samual A Carver [Kc Qh]
TheDeadHand folds
knightfrost calls 60
3rd bullet folds
PETET16 folds
Samual A Carver calls 60
JCullen757 folds
Mr Poker 3rd raises to 300
Looterman77 folds
knightfrost folds
Samual A Carver calls 240
*** FLOP *** [JavaScript Ts 9h]
Mr Poker 3rd bets 720
Samual A Carver calls 720
*** TURN *** [JavaScript Ts 9h] [9s]
Mr Poker 3rd bets 2,760, and is all in
Samual A Carver calls 1,390, and is all in
Mr Poker 3rd shows [Kh As]
Samual A Carver shows [Kc Qh]
Uncalled bet of 1,370 returned to Mr Poker 3rd
*** RIVER *** [JavaScript Ts 9h 9s] [7s]
Mr Poker 3rd shows a flush, Ace high
Samual A Carver shows a straight, King high
Mr Poker 3rd wins the pot (4,940) with a flush, Ace high
Samual A Carver stands up
*** SUMMARY ***
Total pot 4,940 | Rake 0
Board: [JavaScript Ts 9h 9s 7s]
Seat 1: knightfrost folded before the Flop
Seat 3: 3rd bullet didn't bet (folded)
Seat 4: PETET16 didn't bet (folded)
Seat 5: Samual A Carver showed [Kc Qh] and lost with a straight, King high
Seat 6: JCullen757 (button) didn't bet (folded)
Seat 7: Mr Poker 3rd (small blind) showed [Kh As] and won (4,940) with a flush, Ace high
Seat 8: Looterman77 (big blind) folded before the Flop
Seat 9: TheDeadHand didn't bet (folded)