Quote Originally Posted by Taika View Post
Here's a Reddit thread about AST stat testing in Diurnal: https://www.reddit.com/r/ffxiv/comments/54f2hu/whm_and_diurnal_ast_healing_formulas_and_more

As others have said, for raid healing, go for 592 Acc. Crit gives you the biggest healing and DPS boost, and Spellspeed is slightly better than Determination in longer fights (explained here).
It's a good read, but I don't quite agree with the "extra" GCD argument of SpS since the smallest delays such as swapping hard targets, repositioning to reach a displaced party member, needing to rez someone, etc. all erode those "extra" casts. This is why I think the data doesn't represent actual gameplay very well in this situation.

If I've missed something, I'd like to hear it, though.