Hand 1

No read on the players. I check raised max and still got a reraise so I layed down my second set. Too weak/tight?

Party Poker Pot-Limit Omaha High, $0.25 BB (8 handed)

UTG ($18.57)
UTG+1 ($23.64)
MP1 ($5.5)
MP2 ($24.75)
CO ($10.63)
Button ($16.81)
Hero ($24.75)
BB ($51.06)

Preflop: Hero is SB with , , , .
UTG calls $0.25, 1 fold, MP1 calls $0.25, 2 folds, Button calls $0.25, Hero completes, BB checks.

Flop: ($1.25) , , (5 players)
Hero checks, BB checks, UTG bets $1, MP1 calls $1, Button folds, Hero raises to $5.25, BB folds, UTG raises to $18, MP1 calls $4.25 (All-In), Hero folds.

Turn: ($29.75) (2 players, 1 all-in)

River: ($29.75) (2 players, 1 all-in)

Final Pot: $29.75

Results in white below:

UTG had [ 5h 9d Ac Jd ]
MP1 had [ 8s Td 6d 6s ] to win with a flush
I would have won a nice side pot.
Outcome: MP1 wins $17. UTG wins $12.75.

Hand 2

Party Poker Pot-Limit Omaha High, $0.25 BB (9 handed)

UTG+1 ($73.39)
MP1 ($34.52)
MP2 ($23.65)
MP3 ($43.69)
CO ($28.96)
Button ($21.47)
SB ($27.14)
Hero ($25.39)
UTG ($25.82)

Preflop: Hero is BB with , , , .
UTG calls $0.25, UTG+1 raises to $0.57, 3 folds, CO calls $0.57, 2 folds, Hero calls $0.32, UTG calls $0.32.

Flop: ($2.38) , , (4 players)
Hero checks, UTG checks, UTG+1 checks, CO bets $2.28, Hero raises to $7, UTG folds, UTG+1 folds, CO raises to $23.28, Hero raises to $24.82 (All-In), CO calls $1.54.

Turn: ($52.02) (2 players, 1 all-in)

River: ($52.02) (2 players, 1 all-in)

Final Pot: $52.02

Results in white below:
Hero has Kd Kc 3s 3c (three of a kind, threes).
CO had [ 4d 8h 8c 5h ] for straight.
Outcome: CO wins $52.02.

I know I got over aggressive in this hand as I didn't believe him to have a set. I know I screwed this up and should have folded to his reraise. How should I have played it? check call the flop? bet out myself and fold if max reraised?

Hand 3

Party Poker Pot-Limit Omaha High, $0.25 BB (9 handed)

MP3 ($18)
CO ($41.77)
Button ($13.3)
SB ($5.9)
BB ($47.94)
UTG ($23.45)
UTG+1 ($29.2)
MP1 ($13.1)
Hero ($65.35)

Preflop: Hero is MP2 with , , , . MP3 posts a blind of $0.25.
3 folds, Hero calls $0.25, MP3 (poster) checks, 2 folds, SB completes, BB checks.

Flop: ($1) , , (4 players)
SB checks, BB bets $1, Hero calls $1, MP3 folds, SB folds.

Turn: ($3) (2 players)
BB bets $2.85, Hero calls $2.85.

River: ($8.70) (2 players)
BB bets $8.3, Hero folds.

Final Pot: $17

Results in white below:
BB doesn't show.
Outcome: BB wins $17.

Where should I have played differently? This player had been pushing overpairs but also some much better hands so its hard to tell if he's on garbage or I beat him.

Hand 1 - played OK i think. Hard to call here unless you have a read on this guy as likely to re-raise a non-nut hand. I think he shows down AA often enough here (barring no contrary read) that you lose out by calling. Even if he doesnt have it, he likely has a draw that'll be 1/3 equity against you or so. I think I fold here usually.

Hand 2 - CR is OK if you know someone will bet it for you, but I prefer to bet out, it's easier to flush out top set/straight that way. I'm happy to win a small one here. Once CO re-raises you he surely has the straight unless you have a specific read on him to be an utter maniac, in which case your call is pretty marginal. Chance he's pushing with 66 too which would annhialate you. I think you could have got away from the hand there.

Hand 3 - Bit passive. Maybe you could raise the flop if he's the sort to bluff often but lay down when played back at. On the turn you should certainly raise if you think you're good, or MAYBE call-call if you really think he'll keep pushing garbage. I don't think your odds to chase your dubious outs are that great, so perhaps you could fold there. This is all kinda player-dependent and so i guess without knowing what he has you have to try to raise at some point to find out, or call all the way and hope. If he's half decent I think you should probably give it up on the turn; 7 plus any card 5 through T is beating you.