Build Lighting Problem. Shadow "stains" and other

Hello there!
I built a modular house. But when build the lighting I will have problems:

I use this guid: [Why is there shadow splotches on my static mesh?..][2] But it didn’t help. I clear the stains, when change “Static Lighting Level Scale” to 1. But it create another problem: [Modular Asset Lighting Problem][3].

Any ideas about it ?:frowning: