Thank you @illusive and @Chris ,
I’m now setting NumBuffer and PacketSize using the SetParameter method on the devices found before opening them. It works as desired now. The CVB version is 14.0.9.
If I understand Setting PacketSize with Device.Discover correctly, the values in the GenICam.ini file are completely ignored, if the Discover interface is used. So the information is here, you just have to find and understand it 
.
Thanks again.
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