If you read the last patch note you see ...
The Promote Vitality line of augmentations now have constraints so that only players of the proper level may receive the augmentation.
The issue with this is, the spell book is way too small. [:@]
As soon as you have a second class of spell casting (my case; cleric & speritist), there is no way I can keep all theirs spell that my class can cast. Thereis no way I can keep Tier1/2 spells in my list, and have my Tier3 (need when my DP too high) and all my Tier4 spells.
Personnaly I see the following scenarios:
A) Increase the spell book size (at least 3 times the actual one) to accomodate the fact we need to keep the Tier1 spell to buff our guildmate and co-adventurer.
B) Record the spell type (name) versus the exact tier for the maximum spell. I.E.: if I register "revitalized" in my spell book, I can learn all 6 tiers and the quick/power/purifying type versions of that same spell.
C) Let us cast the higher tier spell and pro rata the applied bonus according to level.
In my book the pro rata, is for the players the easiest one to live with. Because I believe what your affraid here is, the fact that low level characters get's huge bonus and go level al much better protection then your designed had planned. Personnaly I have no issue with this, but hey, your the game designer. [;)]