I began collecting success rate on attacks that require saving throws: https://docs.google.com/spreadsheets/d/1YzEY9Tr7LDgg_k3tP8ra6AeazxRH1z969Qx8dIBgvaA/edit?usp=sharing

So far the data are far too few to make any conclusions. I also think my game knew I was recording the rolls, so it let me have a lot of successes on Sacred Flame^^