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Might be worth adding some more hazelnut trees. The American hazelnuts here produce better with multiple trees in closer proximity. I would have to check but I think they are wind pollinated too so insects don’t transfer the pollen. Do you have the European varieties that were developed for blight resistance?
DC, check with your local Cooperative Extension Service or Ag Dept. It may be as simple as a nutritional deficiency. Anyway they could probably give you a solution.