Sorry to hear about your disappointing results with your blueberries.
You can obtain a professional soil test nearby, by contacting A&L Labs. I suggest you obtain a complete soil test for a home garden with recommendations. (See this publication: Laboratories serving Oregon - http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/20037/em8677.pdf)
These publications may also be useful:
- A Guide to Collecting Soil Samples for Farms and Gardens - https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/ec628.pdf
- Growing Blueberries in Your Home Garden - https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/ec1304.pdf