Moving from subfolder to subdomain installation

I’m having a hard time converting a WordPress Mu 2.8.6 installation from subfolder to subdomain.

Current:

URL for the main blog: http://www.domain.tld/blogs/

URL for the rest of the blogs: http://www.domain.tld/blogs/username/

What I want it to be:

URL for the main blog: http://blogs.domain.tld/

URL for the rest of the blogs: http://blogs.domain.tld/username/

Steps I’ve taken so far:

1. Changed BASE in .htaccess and wp-config.php to equal “/”
2. Ran the following SQL queries:

UPDATE wp_blogs SET domain = 'blogs.domain.tld';
UPDATE wp_blogs SET path = (SELECT SUBSTR(path, 7));   (This removed '/blogs/' from every path entry)
UPDATE wp_site SET domain = 'blogs.domain.tld';
UPDATE wp_site SET path = '/';
UPDATE wp_site_posts SET post_permalink = REPLACE(post_permalink, 'http://www.', 'http://blogs.');
UPDATE wp_site_posts SET post_permalink = REPLACE(post_permalink, '/blogs/', '/');

3. I have a script that hits every wp_X_options table and changes the siteurl, home, and fileuploads values to reflect the new URL. I’ve verified that the values are in the database correctly.

4. Re-saved the permalink options

5. Deactivated all plugins.

Results:

1. The main blog page comes up just fine at http://blogs.domain.tld/ as does the admin page for the main blog.

2. When I click on a link for a blog (not a specific blog post), I get redirected to the main blog page. Nothing in error log. Access log shows a 200.

3. When I click on a link for a specific blog post, I receive “Sorry, no posts matched your criteria”.

.htaccess file:

RewriteEngine On
RewriteBase /

#uploaded files
RewriteRule ^(.*/)?files/$ index.php [L]
RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteCond %{REQUEST_URI} ^.*/wp-admin$
RewriteRule ^(.+)$ /$1/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
RewriteRule  ^([_0-9a-zA-Z-\.]+/)?(wp-.*) $2 [L]
RewriteRule  ^([_0-9a-zA-Z-\.]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

<IfModule mod_security.c>
<Files async-upload.php>
  SecFilterEngine Off
  SecFilterScanPOST Off
</Files>
</IfModule>

# END WordPress

If anyone has any ideas on this, I’d be most appreciative.