Hi Alex, we have nothing specifically designed for SEF as far as plugins.
1.I paused cloudflare
2. Went into the joomla global config and disabled:
-SEO Settings
-Search Engine Friendly URLs
-Use URL rewriting
-Adds Suffix to URL
3.disabled the 2 active lines in htaccess
4.Global check-in and cache clear
no luck
our main plugins are virtuemart, kuena, easyblog, admin tools, acl manager,jce, rs tickets.