Meanwhile, the shop where I bought the Brewtus has also done some research. 
They were told that the Brewtus IV (and also the latest III's) are prepared 
to accept pods/servings. Because of that the pre-infusion chamber was 
enlarged a bit and that would be the cause of the somewhat longer time 
before first drops appear.
Btw, I lowered the pressure to 10,5 bar on the gauge and against a blind 
filter. I then measured with a manometer portafilter and that read 9 bar. I 
have the impression that with a 18g VST basket, my shots are much better. 
Before lowering the pressure I couldn't get a proper combination of dose, 
grind etc. I even reverted to a LM double basket because of that. But maybe 
it is just a coincidence.

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