So I got my new balance minimus trail and I almost love them alot. They are pretty fantastic for trails, ok on hard packed dirt and well I don't run on pavement in shoes that much so doable for what I need them to do there. However I have one massive issue. They rub really really bad on my achilles. I tried just wearing them and hoping it would get better but that isn't working so well for me. Has anyone had any luck modifying particularily these but others as well by just cutting out a notch. Or is this likely to cause some sort of unravelling and other problems.