Three bad hands from PLO8 MTT

[FoldALot.]

Pokerstars $5, 90 players.

First Hand

I guess this is not how to play AA4J.
Is raising preflop correct? Should I bet the flop? Villain probably has a wide calling range before the flop.

Poker Stars
Pot Limit Omaha Tournament
Blinds: t100/t200
7 players
Converter

Stack sizes:
UTG: t3552
UTG+1: t3372
MP1: t1310
Hero: t5829
Button: t20114
SB: t7798
BB: t1865

Pre-flop: (7 players) Hero is CO with J[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img]
UTG calls t200 <font color="aaaaaa">(pot was t300)</font>, 2 folds, <font color="#cc0000">Hero raises to t900</font>, 3 folds, UTG calls t700 <font color="aaaaaa">(pot was t1400)</font>.

Flop: 9[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/heart.gif[/img] (t2100, 2 players)
UTG checks, Hero checks.

Turn: Q[img]/images/graemlins/spade.gif[/img] (t2100, 2 players)
<font color="#cc0000">UTG bets t600</font>, Hero folds.
Uncalled bets: t600 returned to UTG.

Results:
Final pot: t2100


Second Hand

Last two tables, final table cashes. I'm 6th or so.
I lost half my stack on this one and ruined my good position. I raised all-in on turn, probably nonsense.
Should I fold the flop? call the turn? If I'm still A high on river and he bets big, should I fold?

Poker Stars
Pot Limit Omaha Tournament
Blinds: t150/t300
8 players
Converter

Stack sizes:
UTG: t4480
UTG+1: t16914
MP1: t9403
MP2: t3392
CO: t5627
Button: t245
SB: t19133
Hero: t8804

Pre-flop: (8 players) Hero is BB with 9[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img]
3 folds, MP2 calls t300 <font color="aaaaaa">(pot was t450)</font>, 2 folds, SB calls t150 <font color="aaaaaa">(pot was t750)</font>, Hero checks.

Flop: 6[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] (t900, 3 players)
<font color="#cc0000">SB bets t900</font>, Hero calls t900 <font color="aaaaaa">(pot was t1800)</font>, MP2 folds.

Turn: Q[img]/images/graemlins/club.gif[/img] (t2700, 2 players)
<font color="#cc0000">SB bets t2700</font>, <font color="#cc0000">Hero ???</font>

Third Hand

12 players remain, I'm 12th and I have only half the chips of the player in 11th place.
Villain certainly has an Ace and some low cards, with AA being a possibility. Should I gamble here? (yes I did)

Poker Stars
Pot Limit Omaha Tournament
Blinds: t300/t600
6 players
Converter

Stack sizes:
UTG: t6260
UTG+1: t10347
CO: t9648
Button: t6298
SB: t32318
Hero: t3127

Pre-flop: (6 players) Hero is BB with J[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/spade.gif[/img]
2 folds, <font color="#cc0000">CO raises to t1648</font>, 2 folds, <font color="#cc0000">Hero ???</font>