Three barrel bluff

He's 27/15 over ~20 hands. If I haven't seen him before it probably means he's bad. This is probably pretty bad and usually I live and die by the 'never bluff a fish' rule but the board seemed to just keep wanting me to bet. Close enough to be ok?

Seat 5 is the button
Total number of active players : 6
Seat 1: spudcracker ( $242.05 )
Seat 2: Hero ( $647.55 )
Seat 3: fiend ( $353.65 )
Seat 4: folly6 ( $315.34 )
Seat 5: HKF ( $415.40 )
Seat 6: TSIANAKKA ( $520.43 )
TSIANAKKA posts small blind [$2.50]
spudcracker posts big blind [$5]
** Dealing down cards **
Dealt to Hero [ 6s, 8s ]
Hero raises to [$17.50]
fiend folds
folly6 folds
HKF calls [$17.50]
TSIANAKKA folds
spudcracker folds
** Dealing Flop ** [ Qc, 2s, 9d ] Pot: $40
Hero bets [$33]
HKF calls [$33]
** Dealing Turn ** [ 7h ] Pot: $100
Hero bets [$70]
HKF calls [$70]
** Dealing River ** [ Ac ] Pot: $240
Hero goes all-in
Hero bets [$527.05]
Villain has $294 left

To me the call on this kind of flop would put me into c/f mode. This hits a good part of V's range (20 hands isn't really a lot) and the A on the river esp. Out of curiosity, how did you appear to him?

I like it. I might consider just c/c the turn depending on how aggro villain is. Rest is std.