Hi Chipp,

> 3. After rotating, MoI mysteriously rotates THESE objects.

Probably a history update kicking in and updating mirrored copies when you are not expecting it.

To solve it you can turn off history updating for those objects - select everything and run Edit > History > "Disable update" button. With the objects flagged to not update with history it should probably get rid of this unexpected result, let me know if that was not it!

- Michael