Hi Mariusz
Clinton's suggestion is what came to mind when I read your post.??
In addition to that, having the "shadow area" including edges of the ply all black helps too. (check out this Scott Brown video.. ? ) It shows how they solved many of the problems.
Not sure if this is a good idea or not, but you could potentially run LED strip lighting in some of the shadow lines.
?
Cheers, David
