Mook Man is level 26 (just got the mk. 12) and RFS is around 22. The sole purpose of this game was to max out the Omnigun as soon as possible, so I skipped many of the quests and headed to AP with the GT at level 18 and RFS at level 11 (soon after I picked him up for the role play element--the GT's android ) The GT with Fang and Saxx (lvl 18) with the Bloodlust managed to keep RFS alive through MANY fights with Maddening Gazers and Plumed Serpents until he could hold his own. It was very nice having Saxx's Mandolin of the Magus and Soulful Sax against the Gazers. (Once they did manage to drive RFS insane--his robotic, monotonous HA-HA-HA cracked me up.)
So now I'm going back through the quests killing everything with my little finger (so to speak). I'm using feather darts with the Omnigun for the sheer sadistic pleasure of watching all of the ailments they cause before the target dies