Just curious, have you had all the vacuum pods tested at the 7 ports located behind the passenger airbag? If the main air flap is not fully closing, this will significantly impair A/C cooling on very hot days. It's a very common failure as there is no major symptom, like air coming out of the wrong vents.
I assume you may already have window film applied to block UV/IR rays, which will also help with heat rejection. If not, check into that as well.