So yeah the Knoxx pt2 says you should be a lvl 51. I tried it at 43 and lasted about 2 seconds in the first fight. Farming the first alien encounter was giving 5k per alien, sucks there are only four in there. I decided to just mow through quests and get my xp that way.

I just hit 45 and am in new haven. I finally found a rare smg that gives 16% ammo regeneration, yeah! Been waiting 45 lvls for one of those.