I think you have something wrong with that FiTech unit. Could be a plugged injector or one of the injectors might have a leak or something along those lines. Which side of the engine is the wide band in? Do you have a second wide band in the other side or is the other side of the engine not monitored? If you are running a close looped EFI system but only checking one side of the engine then there is a possibility that a problem on one side will drive the ECU nuts.

Have you been checking the learn tables and watching the data logs to see what the FiTech is doing? Those plugs tell me that the mixture is way off which means you have something pretty funky going on with your setup.