I'm not intending to be narchy, I'm trying to drive home the message here to OP that he is not fit for these stakes yet and needs to move down to the lower micro levels ASAP where he can work on his game. My suggestion is stop playing 50nl immediately before you hit your patch of negative variance awaiting, cash out all but $100 and go from there. No offence to OP but I don't think it is very likely he will beat 50nl over a significantly large sample, though in OP's defence the information he gave is somewhat limited - but it does say alot imho. He just doesn't have the experience yet needed to analyze his leaks and be able to own the competition at small stakes - but there's nothing saying he can't improve and get there.

As far as how things look he needs to raise more preflop/stop open limping/cold calling as much oop I imagine, raise a ton more in later position/less in early position etc. Alot of money is made from just taking down the blinds preflop, but OP isn't raising enough in late position to take advantage of this. So I suggest that he moves down and builds up from 2nl or 5nl while working on getting used to these necessary adjustments.