I hope that this pretty picture will explain everything 
Increasing culling distance decreases FPS quite significantly in my case, so I try to work around it somehow.
You could try “Use Attached Parent Bounds” on a component if it’s attached to something that is visible. Or you can adjust the Bounds Scale of that component/actor to make sure it’s still rendered.
Changing bounds scale seems like a good idea, I’'ll try that soon. Thanks!