Hey there from germany again
I found a bug and now i know why the album gallery is not so nice then the media gallery :
You use in the media-gallery-item.php "rt_media_thumbnail" But in the album-gallery-item.php 'thumbnail'
I set it in the album-gallery-item.php also to "rt_media_thumbnail" and now look much nicer !
Please use this in the next Update ! Thank you