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No worries at all, glad we could help!

Best practice is to NEVER post the same content on 2 or more different sites.  It is considered duplicate content and although you may not get a penalty the Fox is right when he says that one site will win over the other and chances are you  will lose unless you have a better page rank and authority than tumblr... The only way for what you want to do to work is to be able to add REL=author attribute as well as microdata (HTML 5) distinguishing who owns the original content (yours) to the tumblr content.  and that's not happening... Tumblr is great for quick posting with links back to your site, try and create a brand for yourself... Good luck

Hey Ben, Thank you so much for your response. I 'm pretty sure it was the Penguin update that brought our rankings down. We don't participate in any paid linking, no blog networks etc. The only thing we did was submit to article directories- which i understand are frowned upon now so we'll move away from that. We'll try to get all the non existent pages to show 404 codes and any clear any duplicate page title and page content errors and hope that we'll get back in google good graces.