Question on Boveda calibration kit

[GTS21]

Question for all -- is it better to use the Humidipack calibration bag to gauge accuracy in the same temperature environment where the hygrometers will eventually be placed? The bag suggests testing in "room temperature 65-75F". However, there seems to be a 4-5% humidity difference when testing at 65F versus 70F. The warmer the temp, the lower the RH reading. It seems to me that I'm better off testing in the colder climate, since this is where the hygrometers will eventually operate. Thoughts? thanks