Do a patent search for "corona" and "kodak" and you will find about 1700 hits with extensive descriptions and a list of the problems that must be solved such as uneven corona and ozone removal. The wear of the discharge system and type of "wire" used is also important. Just some thoughts you may want to look into. I don't want to discourage you, just inform you of the mass of data out there and the lists of potential problems.
Again, best wishes and it was a job well done! Congratulations.