lag vs lag: nutFD 3-bet flop?

[skibbel]

my stats are 28/14 but a little bit underavarge agressive
his stats are something like 25/12, agressive
We were playing at 3 tables together and played many pots together, were playing our hands far.
I stacked him in an reraised pot when i hit my gutshot with 55 on 679 board, he couldnt fold 78 when the turn was an 8.
But he wasn't overplaying any hands so far.
PokerStars Pot-Limit Hold'em, $1.00 BB (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP2 ($145.85)
CO ($135.35)
Button ($65.70)
Hero ($99)
BB ($234.80)
UTG ($97)
MP1 ($76)

Preflop: Hero is SB with 8[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Hero raises to $3</font>, BB calls $2.

Flop: ($6) 9[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $4</font>, <font color="#CC3333">BB raises to $12</font>, <font color="#CC3333">Hero raises to $31</font>, BB calls $19.

Turn: ($65) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero ??? / Hero has 65 left.