I started to play HU two months ago. It didnt started really well, mainly, because of villain Selection and mindproblems(Tilt...). Since I got serious and stopped doing bullshit, I am doing a lot better. Lately I saw a guy who battled regulars and I watched his tables. He beat every regular for at least 2 or more buyins. After seeing that he can crush without table selection than I asked myself whats possible in HUNL and how to improve to get one day or soon(1-4months) to such a high level. I know he could be on a heater when I watched, but he seemed just perfectly balanced, never saw something like that.
For a little help to show you where I am currently, my graph. Any idea how to improve that pathetic red line or shouldnt I focus on that now?

Can someone say what this graph looks to you? For example is it possible to get a much higher winrate by improving the red line?

Leak questions:
1) I filtered some Hands which I flat call VS steals. With those Range of hands I lost 100$ -> Should I now stop defending witch those hands when folding is more profitable?

2) My stats. As you can see I play pretty much nitty. Would be nice if someone could point out the biggest leak here, whats letting dropping my red line or generell bb/100