It wasn't me who asked the manufacturer, but one of their largest resellers/online shops (
http://www.koffiewarenhuis.nl). There is no way to adjust it. At least, I could not find how anywhere. What does work is putting a wooden toothpick in one of the holes of the steamwand tip. Then, the Brewtus III gives this perfect microfoam. Before plugging one of the holes, there was no way we could produce microfoam with the 2-hole tip delivered with the Brewtus III.
Now I have this box here with a Vibiemme DoubleDomo PID machine. The 2 boilers in the DoubleDomo are smaller in size (1.4 liter) than in the Brewtus III (each 1.7 liter). Both boilers can be adjusted. The question now is if the extra money paid for the Vibiemme will pay off. I had thought about buying the HX version. However, I didn't.
It all isn't so easy to get this perfect espresso and cappuccino with any espresso machine without doing some adjustments. I wander how people get any decent drink made when they just unpack the espresso machine and start making drinks. We weren't able to get the perfect microfoam without the wooden toothpick closing one of the holes in the steamwand tip, but I would not see everyone else buying espresso machines do the same. Why don't the manufacturers not put in a little bit more care in delivering a better configured and adjusted device?
Now I am to start using the Vibiemme (I unpacked it, but did not use it yet) or send it back and continue using the Brewtus III. Maybe I should first read the review that was just published of the Brewtus III and then decide.
SJ