Thanks. Will check those out.
Update:
SOLVED.
w00t.
So, the issue seemed to be primarily related to redis. ospd-openvas seemed to be looking for the socket at /var/run/redis/redis.sock, while the default path (in debian) is /var/run/redis/redis-server.sock.
Changing the socket path allowed the scanner service to find the redis socket, and changing the socket permissions to 770 allowed the gvm user (a member of the redis group) to access the socket.
It took some time for the scanner configs to actually update, but they appear to be present now. Thanks again, for pointing me in the right direction!