I have a history w Villain ; I tried to push him off top set in my previous session after he min-raised me on the flop.

I have no read on his preflop calling range.

** Game ID 903904200 starting - 2006-08-20 13:30:26
** Accent [Hold 'em] (1.00|2.00 No Limit - Cash Game) Real Money

- sa-online sitting in seat 1 with $85.76
- VILLAIN sitting in seat 2 with $198.00
- jackandjones sitting in seat 3 with $261.15 [Sitting out]
- st777 sitting in seat 4 with $140.67
- HERO sitting in seat 5 with $219.55
- OLEGJ sitting in seat 6 with $48.00 [Dealer]

sa-online posted the small blind - $1.00
VILLAIN posted the big blind - $2.00
** Dealing card to HERO : Queen of Hearts, Queen of Clubs
st777 folded
HERO raised - $7.00
OLEGJ folded
sa-online folded
VILLAIN called - $7.00

** Dealing the flop: Queen of Spades, 6 of Hearts, 4 of Clubs
POT : 15$

VILLAIN checked
HERO bet - $11.00
VILLAIN called - $11.00

** Dealing the turn: 8 of Hearts
POT : 37$

VILLAIN bet - $16.00
HERO raised - $65.00
jackandjones reconnected
VILLAIN called - $65.00

** Dealing the river: 2 of Spades

POT : 167$

VILLAIN bet - $24.00
HERO???

My feeling during the hand was that this could be a set over set situation where villain is slowplaying a relatively dry board. His turn smooth call is strange though.

If you raise, how much do you raise and why?