Bugged Imp potions?
 

When I maxed out my stats at 200 hp, 79 mana, and 66 grace (i'm a priest class with 18 wisdom) the imp potions stopped working and told me I was already perfect. But other people have told me my mana and my grace especially are dismally low, and the improvement cycle is just stuck on hp and won't advance on to the others.

Whats your level?

40 total last time I checked

It depends on your wis/pow stats too.

You can use only a given ammount of improvemnet pots (nor sure how much it was). The pots improve randomly grace, mana and energy.
By praying on the altar of your god you double your grace. Also you increase mana and grace by leveling wisdom an magic or by wearing rings and items which increases wis and power.

Im pretty sure the ammount you can use depends on your level. I'm done with them and I still can't get 540 HP, only 538 =/