I really don't know if the wire could be the cause of those spots. Heck, I'm not even sure that vitamin deficiency is the problem either. I'm just making a somewhat educated guess based upon the information you've provided. Your best best for the Vitamin E with Selenium would be a health food store. It will be in the form of oil in a gelatin capsule. You can poke the end of the capsule with a sharp knife or nip it with scissors and squeeze the oil directly into the beak of each bird. Just one capsule every day. Like I said, this treatment can't do your birds any harm, so I think it's worth a try for a few days to see if you see any improvement.
"Cocci" is short for "coccidiosis." It is a common ailment in chickens and youngsters under the age of 5 months seem to be the most vulnerable. Beyond that age, chickens seem to acquire a bit more tolerance. It's caused by a protozoa that infects the intestines and causes lethargy, diarrhea (sometimes bloody), decreased food and water consumption, weight loss, and in severe cases, death. It is spread through the droppings on the ground. Medicated feed contains the medicine, Amprolium, in a small amount that is usually effective in protecting chicks at least until they are older and better able to deal with a severe infection. A cocci infection in very young chicks can kill them in a matter of a few days. To the best of my knowledge, there are no neurological symptoms as you've described that are associated with cocci.