Replying to Skis mounted back

In the past I have always skied on centermounted ski, I took my AR7's in to get remounted after getting new boots and despite drawing a line on true center and specifically telling them to mount it there, they still mounted them 2.5 back. I usually don't like making a big deal out of these things but should I take them back and try and get them remounted(it would be the third time mounting them) or should i just ski them how they are? Would i notice a difference with them back mounted?
Thanks