Organize Series comes with great built-in styling options and tokens, but none of them specify the template for page titles and the current titles being used are not what I would use.
TOC title: "Series Table of Contents «"
Series title: "Series: 35-hour Baby « Manage Series 35-hour Baby | Family Matters"
Also, whether there is a WordPress page for the series TOC or not, its title and other meta tags are ignored and the default ones are used. I haven't tried the series posts page, but I suspect it's the same.
I've looked at the code and the filter add_series_wp_title (in orgSeries-setup.php) is the function that creates the title within wp_title(). There is also the filter orgSeries_header for wp_head(), but it just adds a CSS link.
It seems that series are treated as archives, in which case Organize Series should be adding all the right stuff to the header. Alternatively, the plugin could require the creation of real pages for the TOC and single-series displays, in which site administrators can configure things to their hearts' content and the default page template settings would pick them up.
Instead of telling the plugin which pages to use, it could also be possible to switch to shortcodes (with modifiers?), but that's a design choice.