Replying to Line Blends - Mounting points??

I am pretty set on these skis for my quiver.. to be used all over the hill.. 30% Charging and Pillows, 30% Backcountry Booters, 20% Groomer, 20% Park.. I will also have Reno Rockers (park/jibby stuff) in my quiver just for information.. The one thing that puts me off is the mounting point at -75mm (-7.5cm).. The furthest back i have ridden in the last couple of years is Lizzies at -2. I wouldn't want to mount further back than that.. will that ruin the ski on groomers? Help