Rates as listed in the OP are fine. Economies in MMOs are destined to change due to new content updates. That's the natural order of things.
Additionally, the number of attempts on chests per day is fixed and small. The number of attempts on a Ragged Zombie or a Banshee is limited only by the amount of time you have to play. Having the base drop chance for each method of acquiring Wools/Tidals set differently only makes sense since a dozen chances per day from chests < hundreds of chances per day from monster hunting. The same logic can be applied to any of the other item drops listed for the chests.
