[107barney]

I would try a hydrolyzed food like Royal Canin hypoallergenic or Purina HA. My dog takes around 6-8 weeks to respond to Atopica. We also must use simplicef and fluconazole to treat bacterial and skin infections. We use therapeutic dosing of omega 3 salmon oil and bathe weekly in malaseb. My dog eats home cooked food.
Your dog needs a board certified vet dermatologist - I see that you may not have one in the area. The above is the protocol ours has had my dog on for the past 10 years.