The fattest ski on the mountain deserves a binding that sheds a few pounds AND locks you with the grip you need. The Pivot 14 XXL is our number one recommendation for the Maven but for a lighter weight rider (sub 165 lbs), the PX 12 gets the job done. Enough to lock you in and let you play hard without the fear of pre-release.
It's normal for your ski tech to look at you weird when you go to get them mounted but a sixer for the hassle should do the trick. The brake needs a slight tweak in order to clear the Maven's overgrown waist.