$3.4 - 3 trouble hands

[mattiesmat]

Here are 3 trouble hands of games I have just played.
I was not sure about the correct play.
Can anyone please review these hands?

-- Hand 1 --
PokerStars Tournament, Big Blind is t20 (10 handed) Converter on pregopoker.com

UTG (t1500)
UTG+1 (t1500)
Hero (t1500)
MP2 (t1500)
MP3 (t1500)
CO+1 (t1500)
CO (t1500)
Button (t1500)
SB (t1500)
BB (t1500)

Preflop: Hero is in MP1 with K[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img]
UTG calls t20, <font color="gray">UTG+1 folds</font>, <font color="red">Hero raises to t125</font>, <font color="gray">MP2 folds</font>, <font color="gray">MP3 folds</font>, <font color="gray">CO+1 folds</font>, <font color="gray">CO folds</font>, Button calls t125, <font color="gray">SB folds</font>, BB calls t105, UTG calls t105
Good raise amount?

Flop: (t510) 8[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img] (4 players)
BB checks, UTG checks, Hero checks, <font color="red">Button bets t100</font>, BB calls t100, <font color="gray">UTG folds</font>, <font color="gray">Hero folds</font>
I did not c-bet, because I faced multiple opponents.

-- hand 2 --
PokerStars Tournament, Big Blind is t100 (6 handed) Converter on pregopoker.com

UTG (t1040)
UTG+1 (t3455)
CO (t1645)
Hero (t4670)
SB (t1670)
BB (t2520)

Preflop: Hero is in Button with 8[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/spade.gif[/img]
UTG calls t100, <font color="gray">UTG+1 folds</font>, <font color="gray">CO folds</font>, <font color="red">Hero raises to t400</font>, <font color="gray">SB folds</font>, <font color="gray">BB folds</font>, <font color="red">UTG raises to t1040 (All-in)</font>, <font color="gray">Hero folds</font>
Too big a raise? Should I have called?

-- Hand 3 --
PokerStars Tournament, Big Blind is t150 (6 handed) Converter on pregopoker.com

UTG (t1260)
UTG+1 (t1520)
CO (t3680)
Button (t5030)
SB (t2270)
Hero (t1240)

Preflop: Hero is in BB with J[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img]
<font color="gray">UTG folds</font>, UTG+1 calls t150, CO calls t150, Button calls t150, <font color="red">SB raises to t300</font>, Hero calls t150, <font color="red">UTG+1 raises to t1520 (All-in)</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, <font color="red">SB raises to t2270 (All-in)</font>, <font color="gray">Hero folds</font>
I did not knew what to do here. AJs is a good hand, but worth a push with the limpers and minraise?