[16s] heads up question

[Semtex]

How bad is racing when effective stacks are 5k or more or at 200/400? I keep losing these A-x vs K-Q, Q-J, etc type races and its really pissing me off. Here's a situation heads up against a typical $16 30/10 donk. It was the first hand, does anybody play it different?:

PokerStars No-Limit Hold'em Tourney, Big Blind is t400 (2 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero (t8260)
Button (t5240)

Preflop: Hero is BB with 4[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
Button calls t200, <font color="#CC3333">Hero raises to t8235</font>, Button calls t4815 (All-In).