Flopped set vs. a LAG's odd line

[NIX]

MP1 is running at 24/19/3 over 42 hands. He's obviously aggressive preflop and quite aggressive postflop. He doesn't peel a lot of flops and on the turn and river, he's is often betting/raising or folding. He has been to showdowns a little less often than I'd expect, but wins a lot of them.

Full Tilt 1/2 Hold'em (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">MP1 raises</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">MP1 caps</font>, Hero calls.

Flop: (11.50 SB) 7[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP1 checks.

Turn: (5.75 BB) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, Hero calls.

River: (7.75 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, Hero calls.

I planned on check/raising the flop since there is a lot for him to call with and worse hands that he can jam. When he didn't bet, I figured there was a good chance he has a higher set. With this particular Villain's reluctance to call bets on big streets, is this ok to balance value, or is it too weak?