Interaction of temp and rh

[shilala]

Relative Humidity is relative to the temperature. That's why it's called relative humidity.
The actual difference of volume of water in a cooler at 55 degrees and a cooler at 75 degrees both at 65% is so tiny it's negligible, and literally not worth mentioning.
You have absolutely nothing to worry about, Colin. You should be overjoyed. You done good.