There is a non-traditional way to wear a NATO strap. Turns out there are lots of videos on it. This video shows it as the third option: three ways to wear a nato strap - Google SearchI just ordered a black nato from LIW to try. Probably try it on the mako first though, haven't had a nato before.
I never thought of that 3rd option, that does seem to make it fit better. Thanks for the video link!