Susan, one of those "strategic" tests would be to test at +2.
As Chris&China said in your post in Feline Health:
"If you think of your spreadsheet like it's a puzzle it will help. Getting tests sprinkled around all over makes it easier to know what the whole picture is. If you just get tests at the same times, it's like filling in the edges with a stripe down the middle.
One day get a +3, +6, +9 and another day get a +2, +5, +8......just look at your spreadsheet and if you see any big white spaces, that's a good opportunity to get a test!
As you learn more about how your cat reacts, you'll learn when the most important times to test (for you) are!
All that being said, I always liked to get a +2 because it acted almost like a crystal ball in predicting what the rest of the cycle was going to be like. (in some cats, the +3 is a better predicter)
If the +2 was about the same as the PS, it was usually going to be a pretty normal cycle....gradually down to nadir and gradually back up again.
If the +2 was higher than the PS, it was usually the beginning of a bounce and those cycles I could take a break in testing.
If the +2 was lower than the PS, that was my "early warning" that I needed to make sure to get more tests in because China could drop a lot lower later on"
Testing Times