Rat Thieves are definitely one of the harder encounters. They specifically take less damage from Carpet Grenades, by the way. Since Roz doesn't drop anything, I usually permanently disable her by stealing her Power Armor, even if I don't plan on using it. I've found that Bored Jumpers are completely disabled by using Airtight Armor. I usually don't enable the Slavebreakers until I'm ready to leave, or want the Heavy Slut Ray, so I don't have too much experience with them.
What are your Perks, Equipment and Stats? Ranged attacks still can't crit, so that may be a problem.