Replying to Mount Point on ARV 116

I am 178cm tall and bought a pair of 192 JJs mounted for 320bsl and I am mounting them for 310bsl.

Should I mount them -1.5 from center? Mount them -3.5 from center? Center mount them?

I think that if the skis are longer than me then a forward mount will make the ski feel shorter and a backward mount will make them feel even longer. I think that the ski feeling shorter is probably for the better since it is much longer than I am.