Too many cycle countless time players complain about too little folders, too many folders, bad drop rates, overly high drop rates, disappearing folders, wrong folders, and on and on.....
Well, take a step back and think about what they really do or add to the gameplay. I remember the first few cycles they were fine, dropping just a tad less then what you need to complete Master, so people refill and buy 1 or 2 packs.
But for as far as I can remember now folders have lost its usefulness in the gameplay. Instead of coding and adjusting the droprate, naming them, using them, Gree, how about just remove this completely.

Please consider it.

It'll save you a lot of trouble in the future.

Chers.