for RES work, i always thought you upgraded TO a Vulture, not FROM it.
Things seem to melt away pretty quickly in one. Even though I could kill anything pretty much in a Viper I do it in a Vulture with out having to worry about getting myself out of the way of the enemies guns.
Out of interest if you go to a RES in one of those bigger ships are you more likely to see biggest ships with bigger bounty???