The proc chance might be why you aren't seeing them very close together. Try upping the proc chance up to 100% so that they should try to cast it every time it is available. Then, try setting your recast delay to something longer like 180 seconds and see if they cast it before that 3 minutes are up.
I will have to do more testing on it, but it is hard when I can only reset my server every now and then to test the changes, or it will effect my players too much if I reset alot.
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