Please don't join endgame content with a job you dont know how to play

[Kaurie]

Double regen is terrible and leads to nothing but overhealing. Any AST that picks diurnal sect when with a white mage or another diurnal ast is bad and should feel bad (though in the case of the latter, both are at fault as either of them could change).

Double regen certainly has its uses.

I haven't leveled AST yet, due to having 60 WHM/SCH, so I have got my heals down. I just had the understanding that their shields were not very strong, and that the regen was the way to go. Perhaps this was changed/buffed/nerfed over time and I didn't realize.