https://support.google.com/analytics/answer/1008080
2. Paste your tracking code snippet into its own include file, then include it in your page header, so that the snippet appears before the closing </head> tag on every web page on your site you wish to track.
One of our customer had a small problem. Google support answered us to move Google Analytics code "before the closing </head>".
Can you add a new widgetzone head_html_tag_bottom and add this code in _Root.Head.cshtml ?
@Html.Widget("head_html_tag_bottom")
I think you should change the default value for plugin Widgets.GoogleAnalytics too.