Wisdom and vitality are virtually useless stats when compared to your pet (assuming you have something semi-decent) a problem that makes item stats unbalanced and irrelevant from the game. With exception to a few scaling items like priest tome, there is no point in even maxing the two stats besides having the satisfaction of the yellow maxed color.
A way that these stats can be brought back into the game as well as making items utilizing them viable again can be done through a scaling system. The idea is as simple as less vit/wis= less hp/mp heal from pets. And before someone becomes defensive about keeping the strength of their pet, know that a maxed stat in either of the two would translate roughly to what ever it is now.
The right curve to this is important, the difference between 40 vit for a ranged and 75 vit for a sword class should not mean a knight gets almost twice as much hp as a wizard. Because of this I created a custom equation for wis and vit based on a pets current heal/ mp heal.
(stat) < or = 40 .15+(stat)/60= ratio of pets current heal
(stat) > 40 .4833+(stat)/120= ratio of pets current heal
This means a maxed 75 vit/wis character will receive ~10% more heal, a nice bonus so people feel the change is a balance rather than a nerf, something it should be.