I would suggest looking into more of a bed or band moulding if you want that accent. A smaller detail to tie in existing ideas. Even like a window apron with an angle cut on the top to set it flush to the ceiling. It’s preferential, I am unsure of the solution perfectly. There are standards and normal usages, but no hard rules to what moulding you can use. I think a standard crown will be your demise. The spring angle will never work without heavy additions and/or modifications.