Actually I think it looks fine from what I can see.
I’m not sure that shifting the .menu-header is what you are after. You should, I think, be moving the #collapse link by adding margin-left.
That will keep it on the orange area but move it over whatever amount you need.
after that I think it’s just a matter of positioning your .nav.
To be honest, it would really help to see images of how this should all look at various states so we know what your end goal is.
At the moment it’s kind of difficult to tell.
