I wouldn't worry about capacity reporting. Windows is guessing about space based on block size and file size. Movies - large files - are more storage efficient than music - small files - and Windows is calculating differently.
In my mind, you have too many volumes. There is no technical reason you can't do exactly what you did. I just like simplicity. Too many volumes and shares bugs me. Music, movies and TV shows are all 'media' in my mind and likely have the same retention policy and performance requirements; I'd put them all together. Surveillance is likely its own thing. Photos are likely their own thing; maybe combine those with Misc Docs. Games and Programs can likely be combined.
When you're planning out volumes, think about how the data will be snapshotted and replicated. If the snapshot and replication schedule is the same, combine. (Another consideration would be performance but, since everything you have is in a single pool, performance can be eliminated as a variable.)
Cheers,
Matt
