PokerStars - $0.05 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

Hero (BTN): 270.2 BB
SB: 12 BB
BB: 202.8 BB
UTG: 169.2 BB
MP: 453.6 BB
CO: 183.6 BB

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has Ac Kc
fold, fold, CO raises to 3 BB, Hero raises to 9 BB, SB raises to 12 BB and is all-in, fold, CO calls 9 BB, Hero calls 3 BB

Flop : (37 BB, 3 players) 8h 6c 3c
CO bets 35.4 BB, Hero calls 35.4 BB

Turn : (107.8 BB, 3 players) Ad
CO bets 23 BB, Hero calls 23 BB

River : (153.8 BB, 3 players) 4d
CO bets 113.2 BB and is all-in, Hero

Villain is 16/12 over 25 hands, no other info.

Keep making the same mistake of not 3betting bigger when deeper, how much bigger should I have gone. As played, is flop always a flat this deep? How about turn and river?