Player 1 is a good player. Can you smell the 6 with his flop call?

€10.00 EUR NL Texas Hold'em

Seat 5 is the button
Seat 1: Player1 ( €15.73 EUR ) - VPIP: 21, PFR: 15, 3B: 7, AF: 1,9, Hands: 15226
Seat 2: Player2 ( €10.00 EUR ) - VPIP: 21, PFR: 16, 3B: 7, AF: 4,1, Hands: 578
Seat 3: Hero ( €10.25 EUR ) - VPIP: 26, PFR: 20, 3B: 7, AF: 2,3, Hands: 332582
Seat 4: Player4 ( €17.43 EUR ) - VPIP: 24, PFR: 15, 3B: 7, AF: 2,1, Hands: 35874
Seat 5: Player5 ( €10.56 EUR ) - VPIP: 23, PFR: 17, 3B: 5, AF: 3,0, Hands: 719
Seat 6: Player6 ( €4.44 EUR ) - VPIP: 57, PFR: 17, 3B: 0, AF: 0,6, Hands: 23

Player6 posts small blind [€0.05 EUR].
Player1 posts big blind [€0.10 EUR].

** Dealing down cards **
Dealt to Hero [ Kh Kc ]
Player2 raises [€0.25 EUR]
Hero raises [€0.75 EUR]
Player4 folds
Player5 folds
Player6 calls [€0.70 EUR]
Player1 calls [€0.65 EUR]
Player2 folds

** Dealing Flop ** [ 6h, 9h, 6c ]
Player6 bets [€3.69 EUR]
Player1 calls [€3.69 EUR]
Hero raises [€9.50 EUR]
Player1 calls [€5.81 EUR]

** Dealing Turn ** [ 9d ]

** Dealing River ** [ Ac ]

Player1 shows [6s, 6d ]
Hero shows [Kh, Kc ]
Player1 wins €11.04 EUR from main pot
Player6 shows [9s, 8d ]
Player1 wins €12.89 EUR from main pot

3-bet bigger.

Seems fine. The fish can have any two pair, and UTG really shouldn't have any 6x in his range. This is the only combo with a 6 I'd expect him to have. There's still 3 combos of 99, but I think a fair amount of 10nl regs will call TT-QQ to the SB shove and will feel pot committed when you shove

I always go for 3x... how should I do it?