way ahead/way behind?

[donger]

PF Raiser is 20%/13%.. only seen about 15 hands at this table, so no real reads. I have recently become familiar with the concept of way ahead/way behind situations, and wondered if you guys thought this was one of them. It seems like it to me, but I couldn't help check-raising the turn here. I guess I'm used to 2/4 where I'll get paid off to the river with an underpair...

Should I have just check-called all the way here?
Party Poker 3/6 Hold'em (9 handed)converter

Preflop: Hero is BB with K[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls, <font color="#666666">3 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#666666">1 fold</font>, Hero calls, MP1 calls.

Flop: (6.33 SB) K[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP1 checks, <font color="#CC3333">Button bets</font>, Hero calls, MP1 folds.

Turn: (4.16 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, <font color="#CC3333">Hero raises</font>, Button folds.

Final Pot: 7.16 BB