Again like I've said a bunch of times now, 2 separate effect modes is a perfect solution; just a matter of SE deciding if they want to dedicate time to do it. (IE each spell/ability has one effect in PVP and another in PVE, so that PVP balance would never possibly affect PVE, because spell modifications for PVP would only change the PVP effect of the spell.) For instance CC lasting a shorter duration when used in PVP, or a spell being less damaging in PVP than PVE.