Villain is a moderate winning player at $30 level. And seems to be somewhat competent. Earlier during 4 handed play he opened K7h OTB, called my smallish SB 3b (we were reasonably deep, but i don't like his PF call), floated my cbet on T86 2diamond flop, checked back A turn, and bluffed 4s river, which I snapped off. I've been very aggressive short handed and won a ton of pots recently w/o much resistance

Poker Stars $100+$9 No Limit Hold'em Tournament - t10000/t20000 Blinds + t2000 - 4 players
The Official 2+2 Hand Converter Powered By DeucesCracked.com

BB: t620765 M = 16.34
Hero (CO): t2096898 M = 55.18
BTN: t423416 M = 11.14
SB: t1130921 M = 29.76

Pre Flop: (t38000) Hero is CO with 7 A
Hero raises to t44252, 2 folds, BB calls t24252

Flop: (t106504) 7 3 Q (2 players)
BB checks, Hero bets t58525, BB calls t58525

Turn: (t223554) Q (2 players)
BB checks, Hero checks

River: (t223554) A (2 players)
BB checks, Hero bets t142525, BB raises to t515988 all in, Hero ??????????

Not really a fan of your river bet-sizing? I mean your line totally looks like some sort of Ace. So what hand is he supposed to call here that you're beating? I mean you're playing the board for kicker, you have 1 of the 7s already so less likely he's calling with that.

As played though I probably fold. I mean it's just too easy to see you having an Ace there, so pretty weird spot to bluff if he doesn't have you beat.

Well since I'd often rep an Ace here w/o one, and since it's a good spot for a bluff, then he'll often call me w/ any PP or 7x if he's good.

FWIW I virtually never have Qx+ in my range on the river, and only sometimes an A, so it's a good spot for a CR bluff. Also, he 3bs AK, AQ pf virtually always and CR AJ or lower for value never, so I'm not worried about a bigger Ace ever.