Many versions have passed since the creation of the config file, should you update it? If you have a farm with multiharvester, do you need to re-import the certificates?
This blog post of one of the forks actually had some good insights on that:
https://hddcoin.org/hddcoin-1-2-5-release/
It seems that the normal update process of Chia does not get you the latest config file, and the default values that are used are not optimal for large farms.