Replying to Bindings adjustment help

so i got new boots this year as my old ones dont fit anymore, iand my questions are, i moved the heel back as far as it can go, but when i click in the heel kind of pushes back then the binding pops up into place, i have marker jesters from last year. is that safe? also on my old boots i had lifters, adn none on my new ones so my toes kinda wiggles up and down mabye 2-3 MM, is there a way to adjust that? its kinda annoying. thanks for any help