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.