I wasn't sure what you were plotting so a bit hard to work out. I normally plot the return as a percentage over X bets. So over 100 bets if it returns 110 then that is ploted as +0.1, and if it returned 90 that is plotted as -0.1

In th csae that you have done If I assume yours is the green line then it looks like a good curve but I can't make any other comments without knowing the type of data you plotted.