I'll try to snap some pics the next time I service the lawn. Most of the hedge is very dense but there are a few spots in the middle are both lower (less growth) and less dense than the rest of the hedge. Basically there are some holes in the top of it. It's a dwarf variety I believe...maybe part of it has dwarfism
I don't think the variations are due to sunlight other than on one end of it.
I just don't like stepping back to look at it and not having a nice even line.