MP is 30/24, 11% 3bet, 4bet 5/40 times. Fold to 3bet = 48%. He's pretty aggro, a little spewy I'd say postflop. 1k+ hand sample
CO 31/23, fold to 3bet 51%.
both are regs

It seems like we should be bluffing big here OTR...but in the hand i gave up like a little punk. a) Do ppl agree this is a good spot?, and b) Sizing?

MP: 113.7 BB
CO: 100 BB
Hero (BTN): 126.2 BB
SB: 123.6 BB
BB: 95.6 BB
UTG: 107.2 BB

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Ad Ks
fold, MP raises to 3 BB, CO calls 3 BB, Hero raises to 11 BB, fold, fold, MP calls 8 BB, CO calls 8 BB

Flop : (34.5 BB, 3 players) Qd 9d 4c
MP checks, CO checks, Hero checks

Turn : (34.5 BB, 3 players) Td
MP bets 17 BB, fold, Hero calls 17 BB

River : (68.5 BB, 2 players) 8s
MP checks