Thanks for sharing wpod. I love soil management dynamics. I manage both greenhouse and nursery soils and do dozens of soil tests annually. Some rules of thumb I've learned over many decades is:
Like blood and oil analysis, soil tests are a measure at one specific time. Nutrient content varies over the seasons and test results can be affected by the seasonal weather, biological activity, etc.. It's best to use a single test as a general guideline, not an exact cook book recipe. The best thing you can do is to test regularly (1 - 3 yrs. outdoors) and trend the analysis vs. your practices.
Soil testing labs calibrate their results to their region and soil types. Often, you cannot compare soil tests from one lab vs. another unless you know their testing procedures and calibration guidelines. It's not unlike how oil analysis labs use different TBN methods and the results are not comparable.
Be careful about pH adjustment because its sometimes difficult to judge buffering capacity. I know a few establishments that messed up their soil for several years because they went a bit crazy with applications.
Soil testing is similar to owning a torque wrench. After a while it kind of becomes a crutch in that you start to use and rely on it more than you might like! The days of guessing are left behind.
Many states have land grant university extension programs with lots of regional based expertise. Try tapping into that knowledge base.
Wishing everyone a great new year ahead of us.
