I apologize for not posting a bit more info in my original post, I was posting from my phone.
Check these articles out:
http://www.redflymarketing.com/blog/...ni-case-study/
http://www.johnchow.com/evading-the-...quality-score/
I am aware John Chow´s blog sucks balls but that last one is a rare insightful guest post written by someone else. It´s got some nice tips.