Overhang is equal on both side, I checked long ago looking at the underside of my board so bindings are centered. Hmm, maybe I'm being stupid and over thinking this. I'm thinking of switching to the Union Atlas bindings and asked Union what size bindings I should go for, gave them boot size and type of boot I have and they replied that I could fit in an M/L but that a L/XL would most likely be a better fit so that put me right back into the same size I got now with the Cartels (L)....
Anyways, thanks a lot for the replies I really appreciate it! Where I live its tough to find good gear let alone get any sort of help so this forum is great.