This is interesting to compare to my experience, I must be lucky on our hottest days I'm not seeing this much heat gain in the hottest area upstairs and the basement temp is still inviting, just like yours. The bulk of my heat gain comes from the setting sun as I have lots of unshaded glass from when the evening western sun is setting, which unfortunately is the result of non-existent solar siting as it isn't south enough to help much in the winter.
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