We also had this problem and I fixed it with just one single line of code!
You should edit wordpress/wp-content/plugins/wordpress-seo/frontend/class-frontend.php and change line 736 from
if ( $gplus )
to
if ( !is_front_page() && $gplus )
Afterwards the author meta tag won’t appear on your main page but is still displayed in your other views!
I hope this will work for all of you!