Hero (SB): $856.34 (142.7 bb)
BB: $1,433.01 (238.8 bb)
BTN: $1,897.18 (316.2 bb)

Preflop: Hero is SB with As Ts
BTN raises to $12, Hero raises to $48, BB folds, BTN calls $36

BTN is a very good, aggro winning reg playing 30/21. BUT steal 70%, BTN FoldTo3b 59%, Fold to CB in single raised pot 41%-36%-67% after 1.4k hands. We have a bit of history with some aggro 3betting/4betting preflop from us both but no memorable postflop pots.

Flop: ($102) 6c Js 5d (2 players)
Hero bets $66, BTN calls $66

Turn: ($234) Ks (2 players)
Hero bets $175, BTN calls $175

River: ($584) 3c (2 players)
Hero bets $567.34 and is all-in

I think this board crushes my range more than his since I think he 4bets AK PF along with AA/KK. I likely check/fold a bunch of overcard combos without a BDFD on the flop so I don't think I'm overbluffing the turn in this spot when deep.

On the river, I would jam AK, AA, KK, KJs, JJ, and 66 for value for 27 value combos so I should have around 13 bluff combos given my nearly pot sized bet.
So does firing the third barrel on the river here with QTs, ATs, AQs, and perhaps the occassional T9s seem ok?

I can't really think of any prefered hands to 3barrel from a blocker standpoint since he's not really flaoting the flop with QT and a lot of my combos that block Kx that may or may not float the flop also block Jx which I'm trying to get to fold on the river (along with the occasional TT/99 type hand). One thing to note is that I did win a few consecutive pots without SD vs him over the last few minutes but I view him as a smarter player and don't know if that would sway his decision or not.