PokerStars Zoom No-Limit Hold'em, $0.05 BB (9 handed) - PokerStars Converter Tool from http://www.flopturnriver.com

Button ($4.93)
SB ($5)
BB ($1.09)
UTG ($14.82)
UTG+1 ($2.95)
MP1 ($3.32)
MP2 ($5.13)
MP3 ($5.11)
Hero (CO) ($8.81)

Preflop: Hero is CO with A, K
UTG raises to $0.15, 2 folds, MP2 calls $0.15, 1 fold, Hero calls $0.15, 3 folds

Flop: ($0.52) 3, 3, 4 (3 players)
UTG bets $0.30, 1 fold, Hero calls $0.30

Turn: ($1.12) Q (2 players)
UTG bets $0.45, Hero raises to $1.19, UTG calls $0.74

River: ($3.50) 10 (2 players)
UTG checks, Hero bets $1.76

Total pot: $3.50 | Rake: $0.15

Preflop I didn't 3bet because I don't know my opponent and there are lots of players playing really tight on UTG at zoom NL5 I range him with 66+ A9s+, ATo+ and KJs+ and KQo

The flop doesn't hit his range nor mine, but I decide to call because he won't have a pp always, and with AK I'm beating all of his hands that didn't connect. Also I have position on him, and I will play some flush draws that way so it helps me to balance my range (I don't think this is important at this level).

The turn completes the flush and also brings a Q, now I decided to turn my hand into a bluff. I think on the turn, I get called by 99+, AQ, KQ and possible a hand with the ace of hearts, like AhJx, AhKx and AhTx, and of course flush draws (AhKh, AhJh, AhTh, Ah9h, KhJh)

On the river I'm betting 1,76 into a 3,50 pot so: 1,76/(1,76+3,50)=0,334
This means I need to get called 33% of times or less, for the bluff to be profitable in a vacuum.

all his possible combinations:

99(6), TT(3), JJ(6), QQ(3), KK(3), AA(3), AQ(9), KQ(9), AhJx(3), AhKx(2),AhTx(2), AhKh(1), AhJh(1), AhTh(1), Ah9h(1), KhJh(1).

I expect to get called by all the flushes and full houses and AA or KK so:
total possible combinations: 51
combinatios I get called with: 17
17/51=0,333
So this bluff will be slight profitable in a vacuum on the long run, now I realize it might have not been the right choice to make this bluff. What do you think guys?