Hello my friend..do not loose hope.
There is a scenario in here where a guy submitted his 2013 FBI Police Certificate along with his current state certificate and explained that it is taking over 14 weeks for FBI to process requests. He requested them to consider the state certificate and guess what, CPC accepted it and he just received his PPR on Jan 12th.
Also, this solely depends on the officer dealing with your case, but worth a shot. I would recommend attaching a letter from FBI showing that you made complete effort, but the prints were rejected.