A free subscription to Sales Reports would have saved you all that yakka, and broken all your sales up into both listing ending times and days of the week as well.

Unfortunately, as far as I can see, it doesn't allow for any bias you have in your listing or ending times and days, ie it doesn't show what percentage of listings listed or ending at a particular time or on a particular day actually result in sales; nor, as a consequence, does it compare the strike rates between those variables.