Did you get the full set out of Court 35 that's just a little south and east of Goodneighbor? I think it is leveled though. So make sure that your at least level 30 (I think). Also a set in guard shack on the way to Fort Strong just north east of the airport (you go there for the brotherhood too). I did find 4 legendary pieces (two legs, helmet and chest all T-60) through the brotherhood.