If the benchmark for earning CP is to accurately hit CP mobs, I think they could do have reduced HP at least. As things stand now, magic bursting is a requirement to kill Apex mobs at an acceptable rate- otherwise you are probably just as good killing Reisenjima mobs as fast as possible.
You can get away with having a trust healer, a trust tank, and even a trust damage dealer like Shantotto II since she never misses and reliably closes. As it stands now, you will not get away with a trust nuker however. That's a lot of weight favoring one particular role.