Smuggler Archive

I was wondering, whats the difference in feign death at dirty fighting 1 vs dirty fighting 4. What does the extra points do?

Nathan Bluewater Smuggler and Captain of the Ivory Eagle
Oberon Bluewater Twi'lek Bounty Hunter
fireonice fireonice Dark Jedi Knight
A'idan Corso Merchant Extraordinaire
Behold an YT-1300 and the one that piloted it was Nathan and Vengeance followed with him.