Set on scary board vs. tough player, deep

[Keyser.]

Villain is overbet56, possibly one of you guys. It's been a while since we've played so I don't have a read. He's running 26/20/3.5 over 3k sample. I'm not sure how much of that is from heads-up.

Full Tilt Poker - No Limit Hold'em Cash Game - $0.75/$1.50 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $109.00
BB: $299.25
Hero (UTG): $312.25
CO: $506.55
BTN: $297.75

Preflop: Hero is dealt 9[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (5 Players)
<font color="red">Hero raises to $5.25</font>, CO folds, BTN calls $5.25, 2 folds

Flop: ($12.75) 9[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $10.00</font>, BTN calls $10.00

Turn: ($32.75) 7[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $25.00</font>, <font color="red">BTN raises to $88.50</font>, Hero calls $63.50

River: ($209.75) T[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets all-in for $194.00</font>, Hero folds
Uncalled bet of $194.00 returned to BTN

Pot Size: $209.75 ($3 Rake)

He's definitely capable of bluff-raising the turn, and also value-raising worse hands. Is he shoving a set b/c he thinks I have AA-QQ? I'm lost on this one.