Duets with different innards and outards!
DADoEs, What model Duet are those pictures from? I have a 9150 model and it has the straight baffles in the drum. I would think the ones in your pics would do a better job of moving the clothes around the drum. With your model number I can see if they interchange with mine and maybe "upgrade" our washer.
As far as suspension goes, mine only came with 3 shocks from the factory which seemed to be correct as my sister in law had the same model and it only had 3 as well. I added a 4th shock to both of them and it did help.I also replaced the original springs with a newer part number and they seemed to lift the tub up a little bit.
My drum hangs from the sides on those two springs like your picture shows and I think it could use something more which would keep the drum more level as it drops down a lot in the front when loaded.
And a balancing ring would have been a smart way to go as these machines will not spin if they cannot balance properly.
And I have had problems with the water valves and their ridiculous connections. I lost the bleach dispensing capability a few months back and wound up taking out the factory connector on the valve and replaced it with small stake on terminals and have not had any problems since.