I am still considering how I should set the preferences.
Here is how I have it now with unfortunately some hiccups here and there:
Host (Mac Pro 12 core respectively 24 cores with multithreading):
Logic set up to automatic numerb of threats.
Some NI-Kontakts as Software-Instruments in Logic. Kontakt setup with 2 cores Multicore support.
Slave (PC 8 core):
VePro --> Multiprocessing set to 2 threads count per instance
Kontakt --> Multiprocessor support set to 4 cores
What could be a better setup?