Honestly who cares about the amount of energy credits you get from slavers, I can do a Tau Dewa sector patrol and make more ec from drops in 15 minutes than I can spending hours doing instances with slavers. The great upside people used at least adv slavers for is because they stole contraband which in turn can either sell…
The slavers have been broken since LoR, but there getting a massive nerf with the carrier UI patch I posted a thread "Undo the slaver changes" on what I found out on tribble. http://sto-forum.perfectworld.com/showthread.php?t=804141