Regarding the content on your main account and the PT, as long as the emails are the same your accounts should be linked and cloned.
If that's not the case, you can request the Support team to have your accounts linked for the next PT session.
The Shinonome is often used as a placeholder for reward ships (such as Puerto Rico) especially when that reward ship is not ready yet and still undergoing testing.
Shinonome is used often because she was one of the first grind able ships.
#anchorsaweigh