Congratulations on your new machine!
I have a MOL W1 too. I think it's a very good and very sophisticated machine. Both the UK and German consumer associations have tested machines from the W1 range and they both say the machines are good but rinsing can be an issue. However, I enabled "Maximum Rinse Level" on mine the day I got it. This doesn't add any extra time but it does fill right up high for all the rinses.
The German consumer association also tested Miele's Twin Dos UltraPhase detergent. They found it didn't perform as well as the best powdered detergents while also costing twice as much. Interestingly, my user guide says to do some hot washes with <span style="font-family: arial,helvetica,sans-serif;">powdered detergent</span> to keep the machine clean. So that's what Miele thinks of its UltraPhase! At least you can use the Twin Dos for your own liquid detergents, softeners etc. if you want. How are you finding the machine?