Few hands at 100nl for review

Hand #1
UTG+1 is 18/7 but only over about 100 hands. His flat of my 4bet is pretty scary but his flop bet is so small I called for straight draw. When do we give up this hand? Probably shouldn't even 4bet it right? (I don't always 4 bet AKo and often don't even 3bet it)

PokerStars No-Limit Hold'em, $1.00 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($55.50)
SB ($105.60)
BB ($26.65)
Hero ($102.95)
UTG+1 ($77.60)
MP1 ($82.30)
MP2 ($100)
MP3 ($96.75)
CO ($44)

Preflop: Hero is UTG with K, A.
Hero raises to $4, UTG+1 raises to $7, 4 folds, Button calls $7, 2 folds, Hero raises to $25, UTG+1 calls $18, Button folds.

Flop: ($58.50) Q, J, 9 (2 players)
Hero checks, UTG+1 bets $12, Hero calls $12.

Turn: ($82.50) 3 (2 players)
Hero checks, UTG+1 checks.

River: ($82.50) 7 (2 players)
Hero bets to rep the flush?? If so how much??

Hand #2
I thought this hand is kinda interesting, maybe its just standard I don't know, but I don't think I necessarily played it optimally. Do we raise the flop bet? Flat the flop 3bet? shove?

PokerStars No-Limit Hold'em, $1.00 BB (7 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($131.95)
SB ($86.20)
BB ($64.25)
UTG ($30.85)
MP1 ($127.75)
MP2 ($17)
CO ($161.20)

Preflop: Hero is Button with 5, A.
3 folds, CO calls $1, Hero calls $1, SB completes, BB raises to $3, CO calls $2, Hero calls $2, SB calls $2.

Flop: ($13) 3, 7, 4 (4 players)
SB checks, BB bets $5, CO calls $5, Hero calls $5, SB raises to $20, BB folds, CO folds, Hero??

Hand #3
V here was 15/13 stealing from CO 60% over 300 hands. I know my turn bet was for shit and I can't say why I bet so small, so putting that aside what do we do on the river? Raise for value against set/2pr type hands? His lead (edit - corrected), check/call, lead line kinda confuses me.

PokerStars No-Limit Hold'em, $1.00 BB (8 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($102)
Hero ($97)
SB ($105.55)
BB ($20.50)
UTG ($98.50)
UTG+1 ($102.35)
MP1 ($106)
MP2 ($20)

Preflop: Hero is Button with J, 8.
4 folds, CO raises to $4, Hero calls $4, 2 folds.

Flop: ($9.50) 9, T, 4 (2 players)
CO bets $6.5, Hero calls $6.50.

Turn: ($22.50) 7 (2 players)
CO checks, Hero bets $13, CO calls $13.

River: ($48.50) K (2 players)
CO bets $28.5, Hero?

Thanks!

1. I don't think 4betting without a read on what his silly min3bet means. As played c/c this bet would not be my line because he's only got 40$ left. Just c/f river again since he has only half pot behind.
2. Definitely 3bet/call
3. Obvious shove. Given the likelihood that he 2barrels QJ on the turn or goes for a c/r on the river after taking a c/c turn line, this is a pretty easy value shove. Also fold or raise preflop.

I suck but I'd fold the flop on hand 1, 3bet hand 2, and shove hand 3 without hesitation. Those plays are profitable for me at 25NL at least

O