I'm wondering if there's a data center difference issue here. In my experience RF was useless for solo queue for every Ex fight except Sophia Ex and her queues died too in 3.5. This is from queuing on evenings and weekends as a dps or healer on the Primal Data Center.
And yes I was queuing Duty Complete.

The functionality was nice in theory but not useful if the queue never pops. It would be helpful if that functionality was added to PF to stop people from sneaking into farms.