Betting small pairs for value: when do you slow down?

Do you push your pocket pair in the absence of any shows of strength? Even with calling stations? Should you slow down once there are more overcards than undercards to your PP? Here's a hand that is typical. BB is a calling station, so his calls mean nothing to me.

Party Poker 0.50/1 Hold'em (6 max, 5 handed) FTR converter on zerodivide.cx

Preflop: Hero is SB with 5[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, BB calls.

Flop: (4 SB) K[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls.

Pretty much an autobet given my PF raise.

Turn: (3 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls.

Turn is scary for both of us, and it makes it less likely he called me with a weak K, so I bet again. If the turn had been another overcard to my 5s, I would've probably check-folded, since I only beat 4s and the pot is small. And of course I'm not giving free cards to flush draws here.

River: (5 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls.

I feel like the donks like to bet when I check anyway, since they can sense me giving up, so I decide to fire the 3rd barrel to see if he'll fold.

Final Pot: 7 BB

Standard or laggy?