AA in bb, help please...

[midnight24]

I am 44% ITM over 150 20+2's, but am in the middle of horrible downswing and it feels like i can't do anythying right, even with big pocket pairs. In this situation, i usually try to get value out of the Aces late in the tourney so i put in raises that will be called but lately have been getting killed on the flop. After he called the flop bet, i thought i was in trouble but was hoping he also had an overpair. Anywho, how should i have played the Aces in this situation? thanks

Party Poker No-Limit Hold'em Tourney, Big Blind is t50 (7 handed) converter

CO (t1925)
Button (t1120)
SB (t1125)
Hero (t1105)
UTG (t1385)
MP1 (t1095)
MP2 (t245)

Preflop: Hero is BB with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP1 raises to t150</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t325</font>, MP1 calls t175.

Flop: (t675) 5[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t225</font>, MP1 calls t225.

Turn: (t1125) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero is all-in, MP1 calls

River: (t1125) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 shows (4,4) for a full-house, 4's over 5's

Final Pot: t1125