Hello Peter,
No luck with the flight log, but I did send you a photo of Fw. Eisert from a different source when he was a flight teacher with FFS A/B 13, that's why I accessed the flight log in the first place.
He is also pictured in a group photo here:
https://fliegerschicksale.de.tl/02-.--Dezember-1944.htm
Scroll down to Fritz Beck, Eisert is third from right.
Kind regards,
Daniel