Hi
Thanks for providing the details. You mentioned that in your current situation, an anonymous Marketo cookie is created, and it's details are in recorded in your CRM. Also, you mentioned that a separate Marketo record is created. How is this record created?
Can you drop me a line at alok@grazitti.com, so that I can share a feasible solution.
Regarding Marketo-Wordpress Plugin, it is available online at Marketo Launchpoint
here. For more details, you can visit http://www.grazitti.com/
Regards,
Alok