So I had the same problem on my 2005 ... the top bunched out when folded down. Turns out that some stretch straps had lost much of their stretch. So I "took 'em in" a bit as you can see in the pics. For the strap that goes clear across the top I used zip ties to take up slack on both ends of the strap. For the shorter straps, I cut off the excess slack, removed the attachment bolt, and then reattached the now shorter strap, which gave it back some tension.
In the first pic below, the top arrow shows one end of the strap that goes across the top and the zip tie I used to take up the slack. I did this on both sides.
The bottom arrow shows the shorter strap which I cut and reattached using the existing plastic washer and screw (on both sides of the top).
The second pic shows a close-up of the strap that goes from one side to another.
The third pic shows the shorter strap and washer/screw.
The fourth pic shows the top down with no "bunch."
Last edited by RDavisABC; 03-24-2013 at 06:26 PM.
Reason: added clarity