Are there any nodes showing in the map of team center? I did input your first line into my lab and I got 16 for the affected components. So your parameters are correct.
It would be helpful to check the MOM logs at the same time of that message but in the meantime it may be a hint of a minor performance issue.
I would recommend to have these settings on ALL EM's. A restart is required for the settings to take effect.
transport.outgoingMessageQueueSize=6000
transport.override.isengard.high.concurrency.pool.min.size=10
transport.override.isengard.high.concurrency.pool.max.size=10
Regards,
Matt