years ago when tmax developer first came out i was advised to use tmax instead of "tmax rs" to process my 4x5 negatives. i got a mysterious greenish metalic "stain" on all my films. it was a "dichroic fog" (sorry if i spelled it wrong). the folks at kodak didn't know how to get rid of it and told me to throw away all my negatives ( GO KODAK! ). paul krot at sprint chemistry in pawtucket rhode island told me what to do. i mixed farmers reducer (potassium ferrocyanide with his fixer dilute 2:8). i put the film in hangers, let it sit for about 15 seconds and then washed ... if they were still fogged i repeated until it was gone. this eventually got rid of it.
i am not sure if you have the same green stains, or if farmers reducer will help you out. if re-fixing your film doesn't work it might be worth a try to see if the reducer will work.
john