Replying to Where to mount my skis

I just bought some 06/07 Seth vicious skis in the 189 length. Im 5'10" and like 200 lbs. Im moving to Alta for next winter and i need to know where to mount my Look px 12 ti lifters on them. Since im gonna be at Alta ill be riding mostly big mountain. Im a little afraid the skis will be a little big but i think if i mount them just a little forward it will be ok. So where should i mount my bindings in relation to the k2 marks on the ski for mounting?