You might have a better time leaving meeseeker disabled. E.g.:
# See: https://github.com/inertia186/meeseeker
# :meeseeker_options:
# :url: redis://127.0.0.1:6379/0
:chain_options:
:chain: steem
:url: https://api.openhive.network/
And for the moment, you do indeed need to keep :chain: steem
in the config. I am working on getting Radiator to recognize hive, but for now, you just need to point at a hive node.