I have 171 Line Anthems. I also have Look PX team jib bindngs. Where should I mount them?

I weigh 110 lbs, and I'm 5'6. I know that they are big on me, but I'm not going to use them until next October. If I center mounted, they would be good in park, but I've heard that they would be bad in pow. I'm not sure though, since they're big on me. I'm thinking of mounting them 2 cm back from center to help them in pow, and for carving. Since the thinnest point on the ski is exactly center, would mounting them a little back make it ski weird? I ski 70% park, 30% steeps and backcountry pow. Thanks so much.