-1.5 from true center is what alot of them run on the prodigy's I believe. The ski isn't semetrical so if you mount true center supposedly it feels too far forward. This is what the Faction said when I installed bindings one my prodigy's last season at least.
i do not have specific info for those skis but like stated above^ dont mount true center unless all youre doing is park and you really dont care how they feel when actually carving turns. even then theres an argument not to do so. most people probably run -1 or 1.5