Why don't you do a design hack rather than change. Add in the image of the actual report they get to get people excited. Also add it to your sidebar of the site and have your right side pop up show up further down.
Tricky. Likely many email addresses are dead + others have forgotten your name + why they subscribed. Your steps. 1) Clean your list. 2) Place a link at top of each message that says. Report this message as spam, which then connects to a non-interactive, instant unsubscribe mechanism. This ...