Hi there, we try to get the inserts as close as possible to the centre of the board, so there may be a slight overlap on some boards, I just strapped up a 82 and it's a tight fit but not a problem. A small overlap is no big deal, you can also reverse the top piece of the anti twist plug to see if it fits better, as it functions also as a way to make the stance wider/narrower (it's assymetrical).
Other option is to set the straps up according to jumping/riding positions in case you always have wind from one direction? Personally I would just slightly offset/overlap them and be done with it, should not be a big issue? Maybe send a pic here to see how dramatic that overlap is?