Good work... consider dropping/editing-out the half-pan distinction as color is the big issue on this, not size (unless the half pan means some color that I am not familiar with.) It is confusing to track it with the other variables. Also future experiments should have the pan types written on the paper like the times and parchment/no parchment and time. Your point that all the pans work but take different amounts of time would be best made by a grid of cookies... Across one axis Time, down the other: pan type. If you want a third variable: Parchment consider a third grid all parchment. Absorption of and emissivity of heat is the issue here and shiny pans absorb slower and emit slower. If there is some need for speed (maybe a leavening that does not stay aloft as long?) then the darker pans might be at some advantage but your point is super: Don't blame the pan, just know the influence it has and work with it.

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