Hello Marko,
I don’t understand this. The CHM400 (okay, in my example, using its original name) produces roughly the following grain at 400 ASA in Ultrafin liquid (1+19, 11 mins, 20°C, 3-second tilt non-stop, condenser enlarger):

The scan is of a 16x21 print from a 35mm negative. It is not a cropped enlargement and does not represent a laboratory exception. Scanned with an Apple OneScanner and, apart from some sharpening in IrfanView, without any post-processing.
One of the reasons why I’m now developing the film in HRX-II or Rodinal. Rodinal, on the other hand, is a fine-grain developer. And also one of the reasons why I still use Ultrafin.
Best regards,
Franz (Wolfgang, forgive me)