plattadaddypus.....
have you made sure the fans have been switched to push the air down instead of lift? That makes a big difference in the summer.
you could also consider closing off vents to unused rooms during the day(say III's bedroom)....that'll allow more cool air for the main living area(at least in theory).
Keep your shades closed in the day time will also keep the radiational heat out of the house, keeping it naturally cooler. on the non-sun sides, you can open them for the light.
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