Christian Music DDC Classifications

I'm cataloging my sheet music collection using the "Thing". I'm using the following classifications for my music, but I don't see a good place for some of my collection.

Current Classifications:
782.23 Oratorios - music from Handel's Messiah etc.
782.25 Sacred Songs - Church Choral Anthems and Church Vocal Solos (Not from Oratorios)
782.27 Hymns - Loose hymn sheets
782.323 Mass - Music from settings of Communion Services
782.324 Other Services - Music from settings of the daily offices like Matins.

Other needs:
I would like to break out the hymns into sub categories as I have music for hymns from different traditions including 19th and 20th Century Gospel, Lutheran, Anglican, etc.

I would like to break out the Sacred Songs into sub groupings.

For Hymn Anthems and Descants, would it be more appropriate to group them with 782.25 Sacred Songs or 782.27 Hymns?

I need a classification number for CCM music. I see many collections use 783.7, but I anticipate some collisions with Children's solo voice music which is the current usage of the number.

Thanks in Advance!

Do others use the Library of Congress classification system instead?