Yeah, I hear you on that one! And this is what makes basal testing a little bit challenging. Because you should only make changes if you see a pattern. And most recommend at least three days to test. But wow, that is hard to do sometimes! Not eating for a time frame for 3 days. And than when you get three clean daysto use, there is no pattern. So frustrating sometimes!
And just a side note to basal testing. The key is, if the blood sugars are holding steady and not going up or down, it is set correctly. The hard thing for many if if the blood sugars are flat and at 180, that basal is correct because the blood sugars are flat. Once you get it flat, than you work on carb ratio to help with the higher than you want flat line. Your basal rate really isn’t designed to lower blood sugars, just to keep it flat.
Have fun! And sorry to say, just when you have it set, something in your life will change which means more adjustments.