This is my 3 week 4 Furys running BFG-Miner 4.2.2 on clevermining.com with vardiff for 2 days with each Fury on a separate instance.
bfgminer.exe --scrypt -o stratum+tcp://us.clevermining.com:3333 -u MyAddress -p x --zeus-cc 6 --zeus-clk 340 -S zeus:\\.\COM3 --no-submit-stale

Did you do any mod to it ? what is the temperature of your miner ? seems like one of my week 4 fury is nt hitting 1.3mh. keep bouncing between 1.25 to 1.28