Personity I wont mind PCT just becoming a selfish dps job like blm. Make Starry into a personal buff like you said, remove the team shielding from Tempera Grassa and just have it as person shield, and remove the heal off Star Prism. Melee now has two selfish dps with vpr and sam so I don't see an issue with caster having two selfless dps as well. The casters then would have some what a balance with two selfless high damaging jobs and two support jobs. Honestly I be ok with this since it would allow pct to keep its rotation and most of its dps(it still needs a slight nerf but making a selfish would mean you only need to nerf it a little while also buffing BLM).