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I haven't experienced a home page outranking a product page for anything other than a branded search. Most often a home page is not optimized for a particular key term. It is optimized as an outline for the site and to display promotions or other important things about the site.

I would try to use a Mod Re-Write with 301 to handle the new url with the ? attached. That way your old domain points to the new domain with 301 taking into account the ? at the end. This may do it... <ifmodule mod_rewrite.c="">RewriteEngine On   RewriteCond %{HTTP_HOST} ^olddomain.com$ [OR]   RewriteCond %{HTTP_HOST} ^www.olddomain.com$   RewriteRule (.*)$ http://www.newdomain.com/$1? [R=301,L]</ifmodule> I'm not a pro at Apache re-writes but when I get stuck on coding unfamiliar things I love Stackoverflow just don't get offended by the Elite snobs