[Soapy]

I don't think it should just be more up to RNG, especially since getting 50 RES and 36 LUC isn't quite as easy as you think.
Instead of gutting the chance for it to proc, it should just be less effective instead. 30% damage reduction sounds fine.

Also, nobody uses Painproof for the same reason combatants always use it: because it's a terrible skill.