My question would be "what does your 'thank you' page follow?" Your visitor lands on your thank you page because they have actually been somewhere else - right? Is it possible that your thank you page does not answer the question that remains after the previous page? Would it be possible to raise a question for your visitor that leads into the answer that is inside your free report?
Our creative titles do not always tell the reader what would be helpful inside. I had a similar issue with one of my 'ads' on my blog. I just was not giving enough information. I am hoping that my new approach is a little more enticing.