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I personally like how everything is right now for WHM (except for Benediction, which we already have a lot of requests to change for that). It's not like you can't use Cure II and Cure III right now freely, it will just cost you more MP without the free one; so your RNG issue isn't really an issue really. I have been healing for a very long time and I rarely run into problem with MP in this game, especially if you use Saint of Shroud wisely.
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I think the rng for free cure and overcure are just fine as they are. However, I do see the appeal of stacks, however that is overpowered for our job. Essentially all of these procs for us are shoehorned abilities to combo when nothing is really needing them. There is never a situation where you HAVE to have a freecure or overcure proc, so in this situation, those are icing on the cake that allow you to conserve mp on a class that has issues with mp in some content, so having it be a chance is handy. Though I do feel bad, I tend to not use either proc because they tend to proc at times that I just can't use them and over curing tends to be a bad thing to utilize.