UTG is 16/14/0.9 over 250 hands and I can't remember anything significant about him
CO is playing 35/17 over 40 hands and doesn't seem to good

I normally play bottom two very fast but raising big here didn't feel like the right play for some reason.

Prima Poker skin
No Limit Holdem Ring game
Blinds: $0.50/$1
5 players
Converter

Stack sizes:
UTG: $81.71
CO: $204.10
Hero: $142.58
SB: $229.85
BB: $99.00

Pre-flop: (5 players) Hero is Button with 9 6
UTG raises to $4, CO calls, Hero calls, 2 folds.

Flop: K 9 6 ($13.5, 3 players)
UTG bets $10, CO raises to $20, Hero...
Villain is CO from hand 1

Prima Poker skin
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
Hero: $101.50
UTG+1: $190.36
CO: $76.49
Button: $70.90
SB: $88.71
BB: $232.91

Pre-flop: (6 players) Hero is UTG with 3 3
Hero raises to $4, 4 folds, BB raises to $12, Hero calls.

Flop: 9 J T ($25.5, 2 players)
BB checks, Hero checks.

Turn: 3 ($25.5, 2 players)
BB checks, Hero bets $15, BB calls.

River: A ($55.5, 2 players)
BB bets $25, Hero...
I've been playing particulary aggressive from the CO and BTN, I'm over 50% at stealing at the table at this point and playing like 24/22.
Villain has nitty numbers, 10/5 but has been aggrssive. One hand I remember, he raises UTG, I 3bet with TT from BTN, SB calls and he shoves, I fold, SB calls, Villain shows QQ)
So is this a spew or nice play?

PokerStars No-Limit Hold'em, $1.00 BB (4 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($24.05)
Hero ($177.50)
SB ($122.05)
BB ($475.35)

Preflop: Hero is Button with 6, 8.
1 fold, Hero raises to $3.5, 1 fold, BB calls $2.50.

Flop: ($7.50) 5, 3, 3 (2 players)
BB checks, Hero bets $5, BB raises to $17, Hero calls $12.

Turn: ($41.50) 2 (2 players)
BB bets $31, Hero raises to $87