Nut flush maximizing value?

I have a TAggy image right now. Villian has semi tight image, with nothing out of line. I flop nut flush in position, is this too passive or should I just keep letting the guy bet into me? I didn't like the paired board on the turn so I slowed down and didn't raise. Bad move?

Game #2482952894: Hold'em NL ($0.25/$0.50) - 2006/05/24 - 13:31:04 (ET)
Table "Lundu" Seat 6 is the button.
Seat 1: kirank86 ($74.49 in chips)
Seat 2: Handcuff ($43.50 in chips)
Seat 3: RumRunne ($42.15 in chips)
Seat 4: PassDSuga ($50.10 in chips)
Seat 5: lorensu_X ($29.59 in chips)
Seat 6: colm ($76.74 in chips)
kirank86: posts small blind $0.25
Handcuff: posts big blind $0.50
----- HOLE CARDS -----
dealt to PassDSuga [Ah 7h]
RumRunne: calls $0.50
PassDSuga: raises to $1.50
lorensu_X: folds
colm: folds
kirank86: folds
Handcuff: folds
RumRunne: calls $1
----- FLOP ----- [Kh 3h Qh]
RumRunne: bets $2
PassDSuga: calls $2
----- TURN ----- [Kh 3h Qh][Kd]
RumRunne: bets $6.50
PassDSuga: calls $6.50 RAISE?
----- RIVER ----- [Kh 3h Qh Kd][3s]
RumRunne: bets $8
PassDSuga: folds

Raise the flop, any heart kills your action. If you're lucky he may have flopped a smaller flush or have top two, definitely get your chips in fast. As played definitely raise the turn but play it cautiously.

Raise the flop for sure. You are the pf raiser, so he expects you to raise the flop. I'd call the river getting 3.5 : 1.

Raise the flop. How does just calling expect to get more money in the pot? You're much better off raising and hoping he has something to call or reraise with.

Yeah, raising the flop made more sense here. Thanks for the input.
I think the odds are worse than 3.5 to 1 he doesn't have a K or a 3 here. I put him on a K and was trying to save my $8.