I bought these Flow NXT-AT bindings (size XL), but can't get them to work properly with my DC BOA boots (size 11). The heel of the boot seems too wide to close the highback when the straps are set tightly. The only way I can get the highback raised is to loosen the straps, which defeats the purpose. I'm wondering if there are known issues with this combination. Are DC boots wider in the heel (outside dimension) than others? I'd love to get these bindings to work, because I have lower back issues, and sitting down to strap in is difficult.