Skill Tier Breakdown Chart?

Is there a skill tier breakdown chart anywhere? Could've sworn I'd seen one for Geo-Frailty at least at some point but haven't been able to find it upon looking.
Just pulling these numbers out of my *** but I mean something like:

Geo-Frailty
373+ = 13% Def Down
255-372 = 12% Def Down
222-254 = 11% Def Down


etc etc, some chart like that I can see which spells are different at what skill, not all Geos in my Shell have the absolute max possible skill, trying to see how we should divvy up the spells.

Bump, and yes I checked all the usual places before posting.