Help iOS App Stream?

Hey guys, bought today the Pro Version of Infuse 3, and have some question about Streaming:

I want to stream to my Apple Tv 3 and to my chrome cast.My main problem is this:

When streaming to Chrome Cast, I want to put the option to fit the tv size, but the subtitle doesn’t stay in the middle of the screen, it goes to the right.

When Streaming to Apple Tv 3 i can’t choose to get full screen.