100NL, TPGK facing some resistance

[pokerfan]

villain is a solid regular running 12/9/2.6 over 4k hands. His range on the river is composed of strong ACE, some slowplayed monsters or some occasional bluff. I think that he'd check back those weak ace on the river. Any comments on my play on 3 streets would be appreciated.
No-Limit Hold'em, $1.00 BB (9 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

Button ($96.55)
SB ($14.50)
BB ($54.25)
UTG ($104.95)
Hero (UTG+1) ($104.45)
MP1 ($9.50)
MP2 ($125.80)
MP3 ($112)
CO ($21)

Preflop: Hero is UTG+1 with J, A
1 fold, Hero bets $4, 2 folds, MP3 calls $4, 4 folds

Flop: ($9.50) 8, 4, 4 (2 players)
Hero bets $6, MP3 calls $6

Turn: ($21.50) A (2 players)
Hero bets $12.50, MP3 calls $12.50

River: ($46.50) 3 (2 players)
Hero checks, MP3 bets $16, Hero ?

[badgers]

meh.. this spot is a bit lame. Why did you bet so small on the flop/turn? It's quite hard for him to have draws here ( I don't think a 12/9 is calling much here preflop with SCs) so I think this is AK/AQ a lot and you've induced a float with small cbet. You're getting like 4:1 though and you can easily have 55-77/88-TT here so if you think he gets to river a lot like this w/ SCs then you have to call..