Replying to New boots and binding readjustment

My skis (AR7) were originally mounted with Tyrolia peak 15 bindings using a size 27.5 (319 BSL) Rossignol boot at 2.5cm back from centre. I recently got fitted to a smaller full tilt drop kicks size 26.5 (302 BSL). I noticed the heel of the bindings are adjustable via a lock tab type mechanism, where you lift the tab and the heel can slide forward or back and lock into a new position. I adjusted the heel forward 4 lock slots to my new boots and it seems to fit fine, although more center mounted now. No changes were made to din. Is this a safe alternative to remounting, if not I will go to the shop. Sorry for my ignorance.