Alchemist Proficiency Difference and Extra Storage

Hi everyone.
Generally what is the level range between a recipe and your alchemist proficiency in which it is able to gain experience from the recipe for its alchemist proficiency?
I was offline for months. Today, I found out this feature that lets you store your materials, items and experience which was featured in a Toram screenshot from a player's Twitter tweet. I'd like to know how you can access to this useful extra storage.
Thank you.

 

should be +-10

i would like to know as well. it doesn't appear in any of the menus...

 

Alchemy stops gaining exp when your prof is 11 levels higher than the item level, the Special Storage feature is accessed by linking your Asobimo account to Asobi Market.

 

Oh hey, welcome back! ^^

 

Hi. I'm back with a new account.

 

In the case where you are making Revitas for profiency, there is a crossover when your profiency is equal to (item level +5). At these points, the gain in proficiency for materials used (flower nectar and medicine) is the same. Said another way, below this point make the lower level revitas, then switch to the next higher revita when this point is reached. As an example, for Revita II (item level 25), make it until your profiency is 30.

My schedule is: Save points until prof 10 (attempt about a stack), Then Revita II to 30 (I skip practice revitas and Revitas I, because these don't really sell, but Rev 2 can be sold if you wish), then Revita III to 55, Revita IV to 80 and Revita V to 105. According to my nearly indecipherable notes, you can reach prof 50 and obtain 2-lock using about 20k meds and about 1k flower nectar.

I didn't look at the transition from Rev V to VI.