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Ah, ok. I've now changed Vref to 0.95V (+/- 0.003V, else I'd fiddle with the potentiometers all day) and to 1.22V on E0. I notic a bit less grinding noise at fast retraction, so I might bring it up to 1.4V as you did. Otherwise the printer works well and is very silent.

Now the fans are deafening. I'll now try changing the extruder fan to a Noctua A4x10 FLX but this fan draws 0.03A wrt 0.16A the stock one. Can this be a problem?