Temp staying around 20°c and rh 53% inside the box, will this be better now?
I presume at least for the first days or until buds seem "dry" that parts of the buds, inside, stems, etc. are still rather saturated with water. So whether the ambient air RH is 40% or 60% or higher, the drying process will go on for at least a good part of a week.
What makes you think that one set of moderate temp. and RH is better than another? I don't know what RH and temp is better/best, but obviously everything will dry quicker at lower ambient RH and/or higher temperature, which you may or may not want. Again, if you have the time, it's generally best to dry slower.