Wondering, have you had allergy testing done to confirm what you are allergic to? I was recently in the same dilemma. I had testing and it turns out I am only mildly allergic to Timothy, moderately allergic to Orchard and bluegrass, and strongly allergic to some molds that grow in hay that is harvested too soon. So I was trying different hays, but couldn't figure out what was causing my issues. I honestly would have never figured out that it was the mold. So I am on a quest to find timothy hay that has been harvested and baled at the correct moisture level and hopefully that will resolve my issues. So just consider that you may also have a mold allergy instead of/in addition to a pollen allergy.