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You have a lot of data there, and unlike me, first hand insight into how it was gathered – ie. your feedback while the exams were happening.
I’m happy to help when I can, mainly I provide support for the course. It’s quite iffy to change multiple focal planes at once, to be honest. Visual cortex tends to be far more challenged by not having a single familiar focal plane. It’s not really the course of the scope and falls into the territory of you having your own experiment going on a bit.
It’s good for this to do as you did, and gather as much data from as many sources as possible. No single measurement is going to tell the full story, and vision varies quite a lot depending on lighting and external factors as well as strain levels, sleep, diet, stress.