Saw your lighting pass, you are getting there. But I am thinking you are going too extreme with values here, Indirect Lighting Quality 10 will give you unreasonably long render times. To get good contact shadows you need not to go that low always, I am Using Static Lighting Level Scale - .4 in this scene with Indirect Lighting Quality - 4 (Changed few values in .ini, but I am still not 100 percent sure about their actual benefit and How they are working - That’s the main reason I am not sharing those, don’t want to built unnecessary confusion on something which is already so twisted).