Leggz
From what I can see on my computer screen the only thing you may be doing wrong is over obsessing about something that is totally notmal. Anything less than an inch off the line is usually insignificant, especially with a solid color border as wide as you have. Just straighten up the edge and bind as usual. Once it is washed it will all even out. Just don't talk about it to anyone. If it is not glaringly noticable people don't need to know the details.