I'm sorry to hear about Zeke's allergies. Allergies are so hard.
One idea I had...it sounds like you have tried lots of diets to address possible food allergies. However, I would try to address the possibility of environmental allergies as well. You could try frequent bathing, and see if that makes a positive difference. In theory it reduces the contact time environmental allergens have with the skin. By frequent I mean like 2-3x per week. However, you must make sure to use a separate doggie conditioner (not shampoo conditioner combo) because otherwise the frequent bathing will over dry his skin. It is a simple step that may make a positive difference, but won't harm him in any way. I think it's worth a try!
However, if he has active sores on his feet or legs, then you probably want a medicated shampoo to spot treat those areas. DVM pharmaceuticals (http://www.dvmpharmaceuticals.com/home.html) makes a great line of medicated products. However, you will need to have your vet to look at his sores to determine what shampoo would be appropriate for Zeke's case.
Good luck to you and Zeke!! {{HUGS}}
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