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I for myself didn't notice much changes by some degrees. Also i recommend you to redo your tests at different lengths and/or locations.
For example when I did my tests at home I got almost the same results when doing them outside against a wall or whatever.

I was under the impression that the lighting conditions where you test can have an effect on the results. Don't they?

Sorry if this has already been asked (I tried going through the entire thread/searching google), but how perfectly parallel/aligned do the camera/lens have to be to the target?
I'm asking this because I have a hard time telling if it is perfectly aligned to the target or not so I kind of eyeball it but am not sure just how much of an affect a degree or two off will have on the end result.