$6 NLTRN: ATs on the button vs. flop C/R

[Somekid]

Okay, so I know I probably should've checked behind on the flop (opponent's play is very very suspicious, no idea what I was thinking). But what is my approach after the c/r and on the turn? Also, no reads yet (this was about the 4th hand), but according to sharkscope my opponent had played about 60-70 games with something like a -65% ROI. So I figured he or she was not very good.

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (2 handed)

Hero (t1450)
BB (t1550)

Preflop: Hero is Button with T[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to t60</font>, <font color="#CC3333">BB raises to t100</font>, Hero calls t40.

Flop: (t200) 2[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t160</font>, <font color="#CC3333">BB raises to t320</font>, Hero calls t160.

So I probably should've checked the flop, but after I get check-raised, what's best?

Turn: (t840) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t400</font>, Hero calls t400.

I figured if I was ahead, I would let my opponent keep betting. Is raising here better?

River: (t1640) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t730 (All-In)</font>, Hero??

Ugh...can I fold this?