Do you have pictures of your louvers somewhere?
Driving style definitely has an effect on the amount of grille you can block; when driving more aggressively, faster, and with no EOC I ended up having to reduce my lower grille block down to 80%, whereas if I drive efficiently and EOC when I can I can run a full lower grille block up to close to 100 degrees *F outside temp.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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