Matt,
Take a look at the Boot Lid Rubber Stops. On the actual hatch they are adjustable. You have to loosen an allen key (3mm) and then pull the stop on a ratchet stepped retainer (you will know when you see it)
One pointer would be - Is you hatch easy to close? Mine is not too hard, but not too easy, it sits on the rubbers nicely, but over time they settle.
That would make a lot of sense, appreciate the info, and will post back any info.
Thanks.