A6s blinds battle in 22/180, 14 left

[rubenrtv]

14 left in a 22/180 on Stars. I have been quite quiet at the table, although I have raised my sb every time it was folded to me.
Then this hand occurs and it seems like bb wants to take a stand vs my aggression:

PokerStars No-Limit Hold'em Tourney, Big Blind is t800 (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG (t14950)
MP1 (t43007)
MP2 (t8980)
CO (t11540)
Button (t11035)
Hero (t32130)
BB (t28730)

Preflop: Hero is SB with 6[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Hero raises to t2400</font>, BB calls t1600.

Flop: (t4300) 3[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t2400</font>, BB calls t2400.

Turn: (t9100) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t4000</font>, <font color="#CC3333">BB raises to t8000</font>, Hero calls t4000.

River: (t25100) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ?

Should my cbet on the flop be bigger?
And what is my line on the turn, and after the minraise?
If called, what to do on non-ace, non-spade river?