Dear all!
It seems the meetings on Friday are not well suited for you.
So I'd suggest to meet bi-weekly together with Prof. Barkowsky's group (usually at https://th-deg-de.zoom.us/j/97450455418); i.e., on even calendar weeks only.
You still have the possibililty to reserve additional time slots for appointments with me at http://absolventensprechstunde.peterfaber.net
Best regards,
Peter Faber