Replying to Remounting skis

I recently bought a pair of ARVs and like them but I sort of am thinking I'd like to move the bindings back.. i mounted them a couple CMs up from recommended, but am wondering if i should move them back a bit.. theyre bordering on short for me, and i wouldnt mind losing some tail.. but will moving them back make a noticeable difference in terms of soft snow performance, and sidecut?

also, is it a bad idea to remount them a couple CMs back in terms of putting holes in the ski?

thanks dudes