Not every ride should be in perfect sunshine as there is a certain beauty in riding in the rain
I've run that set up on several bikes for many 10's of thousands of miles w/o incident. But yes, it the rear fender snapped off when I went over a large Rail Road crossing hump yesterday. I have seen the mountings inside the pannier frame and on skid plates for ADV style bikes. I will consider that, but may just fabricate a metal rear fender tail and re-mount the box there. The XSR has a more delicate tail, it would seem!Looks like your rear fender got tired of carrying that heavy pelicase around all the time 😅
Maybe mount it inside the left luggage rack?