54$; 10man; bb40; KK, 3bet pot, A high board

Grabbed by Holdem Manager
NL Holdem $40(BB) Replayer
SB ($2,000)
BB ($2,000)
UTG ($2,000)
UTG+1 ($2,000)
UTG+2 ($2,000)
MP1 ($2,000)
MP2 ($2,000)
MP3 ($2,000)
Hero ($2,000)
BTN ($2,000)

Dealt to Hero K♠ K♦

fold, UTG+1 raises to $120, fold, fold, fold, fold, Hero raises to $270, fold, fold, fold, UTG+1 calls $150

FLOP ($600) A♣ Q♦ 9♥

UTG+1 bets $300, Hero calls $300

TURN ($1,200) A♣ Q♦ 9♥ 8♣

UTG+1 checks, Hero checks

RIVER ($1,200) A♣ Q♦ 9♥ 8♣ 6♥

UTG+1 bets $600, Hero calls $600

big time looser 17/11/1.9/521, raise 1st EP 19%, fold to 3bet 9% (11)

i guess against such a guy i can 3bet pre bigger

flop - i cant really fold, can i?

turn - absolutely no point in betting, right?

river - snap fold anybody? If he went for another barrel on the turn im obv folding but this line just seems so much weaker.. Do you really think he would check turn with his strong hands? Ive assumed that he might be doing it with KJ, KT as a pure bluff or Qx, JJ-TT as a bluff/blockbet. Am i being too optimistic? he seems pretty tight passive after all..