Hit and run! They can't take the pounding either, and if you can damage the engines on one, you can wait for it to fall behind the others while you recharge.
Also, for the same storyline with improved physics, try P&Nism:
http://imagemodserver.mine.nu/other/...lCampaigns.rar
Screenshot:
http://imagemodserver.mine.nu/other/...%20attack1.gif
Also fun is the leaky armor fighter I added as a starting ship in campaign 2:
http://imagemodserver.mine.nu/other/...morFighter.jpg
Missiles can't target you, but point defense cannons hurt!