DxO said in the PL6 release notes that behavior of the slider >100 is undefined. In many cases, raising it above 100 was exactly the same as setting it to 100. But in one case (Generic / neutral color with the DxO Wide Gamut color space, as I recall), I’d discovered that raising it to 200 was beneficial for an image with ridiculously saturated reds, as this recovered a lot of lost detail and color. Now another method will be needed for that particular image.