Replying to Salomon QST 98 189CM mounting point

Hi, I have a pair of QST 98 and I would like help with mounting point off this skis.

I would like use skis like all mountain. Some carving, piste, powder, butters, drops, jumps and some like that.

Factory rec. is i think -8,5.

My opinion is -5 or -6. I have seen salomon video, where looks like that this guy have a bindings more centered.

For powder I use JJs 2.0 -5 factory rec.

Thank you to much