I am riding an 3 year old pair of Burton Tributes, size 11 with 2013 NX2-AT bindings for about a month now and find them to be very solid with no issues whatsoever.
Make sure you have the power strap centred on your boot. You should have the same amount of ladder strap on each side of your foot, both front and back. Take the time OFF the hill to get your boot / binding setup very close to ideal. If you have done this, you should only have some very minor tweaking to do once you are riding.
Also check to see where the canting pad is positioned. It is adjustable, ( small screw under your heel which is a huge ice magnet, only minor downside that I have discovered) and see if moving it will help with your issue.