The falloff curve editor needs serious work.
The point snapping has never really worked correctly, has anyone tried moving point to grid intersections and had them work correctly ever time?! I would be surprised. It also appears that you are restricted where you can insert points which can result in having to move all the points again to get back to the same curve shape.
The curve also bears little resemblance to what the sculpt brush actually does to the mesh surface. This in turn makes me concerned about the accuracy of colour correction curve tool.