Whiffed AK, second barrel? (50NL)

Opp is 22/10/2.0 over about 70 hands. Is this OK or is it spewing? When do you fire a second barrel when your flop c-bet is called?

PokerStars No-Limit Hold'em, $0.50 BB (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP2 ($50.25)
CO ($43.20)
Button ($46.25)
SB ($25.20)
BB ($57.50)
Hero ($50)
MP1 ($18.55)

Preflop: Hero is UTG with Ahttp://www.flopturnriver.com/phpBB2/...iles/heart.gif, Khttp://www.flopturnriver.com/phpBB2/...miles/club.gif.
Hero raises to $2, 5 folds, BB calls $1.50.

Flop: ($4.25) 8http://www.flopturnriver.com/phpBB2/...iles/heart.gif, 7http://www.flopturnriver.com/phpBB2/...iles/heart.gif, 7http://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
BB checks, Hero bets $4, BB calls $4.

Turn: ($12.25) 3http://www.flopturnriver.com/phpBB2/...iles/heart.gif (2 players)
BB checks, Hero bets $8

I'd typically fire w/o a draw. Getting c/r'ed won't make me happy.

One stat I like to look at before second barreling if fold to c-bet %. If it's below ~60 or 70%, I'm firing a lot of second barrels b/c they're floating a fair amount. I don't like this board for a second barrel b/c a draw completed, you picked up a draw and you don't really want to see a c/r here (as lahooza mentioned).

i dont like this at all, peel one off