Lets make Lightmass EPIC (and understandable)

Thanks.
In my installation folder, it’s named BaseLightmass.ini.old.ver
I copied its content to my “project folder\Config” and renamed it to BaseLightmass.ini. I still see splotches everywhere. How do i know if it’s taking effect? should i reopen the project or is rebuilding the lighting enough? (i already tried both)

I have UE 4.7.6 and 4.8.3 installed