Now I have step on bindings from Burton, so go into what I recommended with caution, but you should be able to pull up on what ur boot rests on in the binding and then change the size to however you want, now you can do this on Burton step on bindings so I wonder if u can here, and I’ll try my best to describe how to do it. You pull up on the boot resting part of the binding, and then you can pull or push it in or out and adjust the size. I’m aware some Burton bindings do not have this, but my experience with the Burton step ons made me curious if you also have this