Hawthorne varieties

Some Hawthorn varieties are reported as more edible than others by PFAF eg. http://www.pfaf.org/user/plant.aspx?LatinName=Crataegus+schraderana, http://www.pfaf.org/user/plant.aspx?LatinName=Crataegus+tanacetifolia, and http://www.pfaf.org/user/plant.aspx?LatinName=Crataegus+succulenta.

Has anyone tried any of these varieties and how edible did you find them? Does anyone know if they can be a component of chicken or Muscovy duck food?

Does anyone know how they would fair in the Pacific Northwet Coast?

We've got lots of Hawthorn self-seeded on our property and along its edges. If I can graft more useful varieties to the existing shrubs it would be useful.

Thanks