I just hate running the same lost sector over and over and over and over and getting nothing. Ran the one for arms on my Warlock so many times I had 31 enhancement cores. Only exotic I got was Sunbracers... So I'm still running around without the "must have" exotic warlock arms. Everything else dropped fairly quickly. But the "I'm 1270 and can't do a 1250" thing I just don't get. If that's the case the best exotics in the game aren't going to help you.