I am not a fan of dryboxing. My logic is pretty simple with regards to why. I don't think that your cigar dries out evenly. It makes sense to me that the portion that is exposed to a dryer environment will lose moisture first. So this means to me that the wrapper will dry out more quickly than the inside.
I know that it would wick moisture from the binder and filler but it seems that in order for the wicking (osmosis?) to occur there would have to be movement from a higher concentration of moisture (binder and filler) to a lower (wrapper) meaning my cigar would not be even in RH...........that then leads to a variance in the burn.
While the difference is likely minimal and probably not noticeable........I would know and even if the difference is only psychological it would still be a difference.
I also store my cigars at 62.5% and find they smoke just nicely there. I don't smoke from my ageing coolers so the higher RH in them is irrelevant.
But then again maybe I am just a little more fastidious than others