Unfortunately, this isn’t going to work. You can not use these more complex items like the “post__in” parameter in a single query string. The only way I’m aware of to accomplish this would be through customization from your Child theme’s functions.php.
See my answer here in this topic: http://support.themeblvd.com/forums/topic/tip-simulate-post-grid-for-specific-pages/
With that little trick (#2 on my original response there) that’ll give you a little trick you can do in order to actually get complete control over a query.