I have my EPs mounted at true center with Jesters. They work pretty good so far. If you're mostly skiing deep pow I'd put them where it says to on the top sheet (I'm 1.5, maybe 2cm in front of that)
I would go with the Jester over the old Pivot solely due to the larger footprint of the binding on the ski. More force on the edge and less likely to rip out.
Be super, super careful mounting them. I think they're not as deep as most skis underfoot, I had heard they were shallow and let my tech know so he was really careful mounting them and after a few weeks on them you can still see some very slight dimples in the bases where the screws are pushing on the base material. Considering grinding the screws down a little bit or try find some slightly shorter ones.