You don't want characters balanced on group play, but you want them balanced on PvP and PvE... excuse me?? These are all predominantly group activities. Unless you can solo some UB's and end game dungeons you need group play. Guild PvP will eventually be groups of 6v6, not 1v1. You MUST account for everything a class can do and balance accordingly.
Support classes are weaker alone and stronger in large groups. You shouldn't have both. If a support class was strong alone it would be ridiculously strong in group play.
I assume you just don't want certain skills to be unusable when a class is solo. Like Carnival doesn't help a Mask solo and Stasis Flux doesn't help a Fogger. But it doesn't matter, especially with MM. Every class should be able to use it's support skills in almost every fight now.
This post has been edited by Gynrei - September 28, 2016, 00:22:55.