I received a fantastic explanation of what is going on with the Youtube Content ID Match system with at least some of my music (typically the ones that Sony and Universal are claiming rights to).

False Content ID with Classical Music

Thanks, Will!

I'll try to keep everyone here posted as to the goings on of this battle - hopefully, this will cause a change in the "right's holders'" policies. If it does not, then I can at least provide everyone who gets hit by this the details of how to go about fixing it.