NPC Spell List Recast Delay Not Working

[moydock]

I tried setting the proc rate to 100 and oddly they don't seem to try to cast any quicker. Like, I attack them, and they wait awhile to cast the first nuke. Possibly because they need to wait the recast delay before casting the first spell.

Trust me though, I've sat in front of these things a lot. I would have seen one double cast by now.
I originally implemented the recast so that healers wouldn't chain heal themselves when they got low on health. And they don't anymore. I guess it's possible this has been broken in one of the somewhat recent updates.