A Hand for Thought

This hand happened a few days ago, but I don't remember the reads I had. Looking at the hand will lead to some insight about slowplaying and the hazards.

FullTiltPoker Game #26600528993: Table Stultze - $0.05/$0.10 - No Limit Hold'em - 22:42:19 ET - 2010/12/21
Seat 2: vheater1 ($12.77)
Seat 3: davaman4 ($17.91)
Seat 6: sweetkiss19 ($10)
Seat 7: ffcowboy76 ($8.44)
Seat 9: WarDragon0 ($20.21)
vheater1 posts the small blind of $0.05
davaman4 posts the big blind of $0.10
The button is in seat #1
*** HOLE CARDS ***
Dealt to ffcowboy76 [As Qh]
sweetkiss19 raises to $0.35
ffcowboy76 calls $0.35
WarDragon0 folds
vheater1 folds
davaman4 folds
*** FLOP *** [Qd 5h Ac]
sweetkiss19 bets $0.85
ffcowboy76 has 15 seconds left to act
ffcowboy76 calls $0.85
*** TURN *** [Qd 5h Ac] [4c]
sweetkiss19 bets $2.10
ffcowboy76 raises to $7.24, and is all in
sweetkiss19 calls $5.14

Spoiler

ffcowboy76 shows [As Qh]
sweetkiss19 shows [4s 4d]
*** RIVER *** [Qd 5h Ac 4c] [Jc]
firedemon86 sits down
ffcowboy76 shows two pair, Aces and Queens
sweetkiss19 shows three of a kind, Fours
sweetkiss19 wins the pot ($15.90) with three of a kind, Fours

On the flop I think my decision to slowplay wasn't necessarily a bad one, just ended up unfortunate. Before looking at the rest of the hand, tell me what you think my opponent had and if you agree with the slowplaying line I took.

Many opponents are c-betting most of their pre-flop range there. In this situation, I look to my HUD and see what their c-bet percentage is, and if they've folded their c-bets to a raise. If their c-bet percentage is low, I want to raise because they likely have a piece of the flop and won't fold. If their c-bet percentage is high, but they call when their bets get raised, I want to raise for the exact same reason. Otherwise I consider just flatting.

Id do exactly what you did