8.75 diff - metal in oil (pictures). Is it ruined?

Thanks, its just very slight and I noticed it. I wondered if it was not quite true when it was torqued down, might have put a bit of extra pressure on the bearing causing the heat.

So can anyone advise what is best for me to do next.

I need to machine the cones down, then shim them to counter the amount taken off.
I need to clean the diff fully
Should I just re-asemble, or should I change the bearings and give it to someone that knows all the settings required for such a complex component?
I will add a magnet to the sump plug

Concerns:
I still can not see where all that metal has come from, any suggestions further to this?
Could an imbalanced prop shaft cause any bearing problem (I do have a slight wobble up at 60mph which feels not wheel related)

I want to do this once, do it properly (even if it is a bit on the cheap and I am not replacing the suregrip) so I have a good few more years use from it.

Thanks for all your help chaps!

Jon