Update:
Well, I did another flush today. This time I did it all myself rather than using an indie here in Budapest. Followed the guides on most forums, drain sump, change filter, sum back on, add 3ltrs or so and drain TC using return line from bell housing.I bought 20 lrts of fluid so I could double flush if needed. I did the flush once, went for a drive then did it all again, new filter etc.... but this time I kept going with the TC drain until fluid was red. This took 5 ltrs the second time - i kept pouring slowly until new fluid appeared.
Sump wasn't too bad but the fluid was green but id say it wasn't smelling much different to the new stuff but I am a heavy smoker so I might be way wrong !
What was interesting/worrying is the sump has some powder coating missing - about 3mm by 1mm i the lower corner. Ill up a pick once I get my phone hooked up to the PC. I also has some small shard of metal which is like a 2 mm long piece of very fine wire. like a metal pesky nose hair That was on the magnet. Magnet was covered in minute layer of very fine grey dust whats looked like paste but when I touched it was like wet iron filings - not exactly the same but that's the closed I can think to describe.
I reset trans adaptations with star and went for a run. Nice clear straight flat motorway.
No more shudder ! I cant quite believe it but its no longer there. Question on my mind is for how long.
now I can feel very slight movement at around 75 ish which I probably used to put down to the trans issue. Feels like balancing. My tracking is a touch out so Ill get it all sorted when I have that done. I need to find someone in BP who has a good hunter system to get the full geometry done but might be a MB stealer job.
IF this lasts I'll be well chuffed.
Thanks to all for your help
and tomorrow is that special Monday for sure - its late this year but very welcome 
