Completely remove eBay's user tracking code at the top of your forums. You still have the rest of that ebay script in your forum.

Your eBay search script had two parts, the JavaScript (the "<head> ... </head>" portion) and the HTML (the "<body> ... </body>" portion).
1) The JavaScript part was in your Header Insert [You've fixed this one]
2) and the HTML part is still slowing down your website.
Control Panel / General / Primary: Category & Forum Page Settings "Community Introduction Body"