Hows my line?

I have flopped top 2 pair with AK a few times in the last week....every single time I bet out the pot or close to it and everyone folded. This time I tried betting a tiny bit weaker...2/3 of the pot...Not sure if this is a good idea with two hearts on the board and possible straight draw.

No real read on villain....he was 50%/0% after 15 hands.

Thoughts on every street?

(sorry about the HH, it wouldnt convert...its from pokerroom.com, not sure if it is convertable?)

Seat 1: Punisher007 ($23.75 in chips)
Seat 2: berkshire78 ($27.80 in chips)
Seat 3: Hero [KC,AD] ($54 in chips)
Seat 4: I-Q ($69.35 in chips)
Seat 5: scottco ($66.50 in chips)
Seat 6: crocket44 ($72.65 in chips)
Seat 7: michaeld79 ($81.95 in chips)
Seat 8: jacksonx5 ($61.50 in chips)
Seat 9: royboy69 ($60.50 in chips)
Seat 10: noboundary ($50 in chips)



ANTES/BLINDS
jacksonx5 posts blind ($0.50), royboy69 posts blind ($0.50).

PRE-FLOP
noboundary folds, Punisher007 calls $0.50, berkshire78 folds, Hero bets $2.50, I-Q folds, scottco folds, crocket44 calls $2.50, michaeld79 folds, jacksonx5 folds, royboy69 folds, Punisher007 folds.

FLOP [board cards 5S,AH,KH ]
Hero bets $4, crocket44 calls $4.

TURN [board cards 5S,AH,KH,7S ]
Hero bets $11, crocket44 calls $11.

RIVER [board cards 5S,AH,KH,7S,3S ]
Hero bets $17, crocket44 calls $17.