I've never had the ball cups pop off except for one that I didn't cut threads in, and at that only when I adjusted camber, never on the track. I thought that was the problem people had with the ball cups, I'll count myself as lucky then!
As for the outer hinge pin I'm pretty sure the only break when the set screw is to tight, it shouldn't even touch the pin, just be in the slot so that the pin can't fall out, sure it'll slide a little but that won't affect performance. Sometimes I think they should have included nylon set screw's for those pins, it would act less as a fulcrum in a crash and lighten up the unsprung weight a tiny bit.