when i have my boots on and i am strapped in and even when my binding straps are all the way tightened, i can still move my foot around quite a bit and i can get my heel of my boot off the binding too. i have ridden like this basically forever but just noticed it the other day and was wondering is it supposed to be like this and if not how can it affect my riding?
Sorry about the hijack.
To answer your questions, the boots are not supposed to come off the binding. Your foot should not move around in the boot. Your heel may come off the boot but that should be minimized (this is the problem I have on steep).