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Missed your reply, thanks for the tips! I will definitely try adding leather washers between the mudguards and the frame when I get the chance.
I think I also need to re-radius them, they're too big for my tyres (50 mm Berthoud with 32 mm GP5000), so I pushed the mudguards in so they follow the tyre, which isn't good.Regarding contact points, I've got a third mounting point on the front (custom rack for my Edelux) which has definitely helped.
I'll let everybody know what I did once I'm happy with the noise level :)
And once again thanks @motoko as well!
Veblen
Berthoud mudguards can make noises. My problems on a bike I use on mixed terrain was fixed by adding a second set of stays, the middle of the rear and the long extension on the front both flapped about. I’m using very short rear stays, attached Thorn style to an eye on the rack, they’re solid as fuck now. I think noises can emanate from bolts where they attach to the frame, and where the guards interface with the stays. I’ve experimented with small pieces of rubber and leather washers here and there, and they’re silent. Try adding rubber washers at the frame first.
Yes, you can reuse the SKS QRs normally specced on the front, I’ve used them at the rear to allow wheel removal on ‘track ends’. They’re very solid, takes some force to pop the looped bit of the sks stay out and back in again.