I recently purchased an R5 and I think it will be awesome.  However, I am having problems with the focusing.  I set up back button focus and have the AF set for focusing on the eye or a field.  I am finding that if there is no eye, or it can't find it, all I see are little squares jumping all over the place.   If I set the AF to a point and try to focus it is never in the center of the viewfinder.  Am I missing something?  Also, I wanted to set up the * button for regular scene focusing but I can figure out how to do a second back button focus.  I really want to love this camera.  Any suggestions will be appreciated.