Hi Hum,
I got a pair of graphite guards fitted to my new recumbent which has a rear shock and they looked good and worked well until the rear guard snapped from vibe flex. I patched it several times with roof & gutter silicon but over time that even wore out. The front guard is still AOK. I have a touring panier rack over my rear wheel and so I glued together two side sections of a 2.4l Berri juice bottle and cable tied them to the undersiide of the rack. I left the front section of the damaged guard in place. This seems to have done the trick. There is stiil enough clearance between the guard and the tyre even when I hit a bump. I live in Tully and I have ridden to Cooktown return. There was some pretty wet sections. I have had no more worries with my new (cheap) rear guard..
rt