Question one: there is a base damage chart somewhere, I will see if I can dig it up.
Question two: yes, your heal will do more, providing you have more INT/HM than the character it is being viewed on.
(example, the item is on a mule with 10 int, your mage has 60 int. the heal will be higher on you)
also, I believe heal mastery is not shown on the charm, but calculated after. so you dont really "see" it's effect. someone verify this
/edit:
Autism's INT vs HM Guide, this is good info but not what you need/edit: yes, HM is better than INT if you are a catacomb healer, which most mages prefer if they dont have 10k+ to invest in solo gear.
I find a happy blend of both works the best, keeping HM as high as you can, using a HM main charm and ACC heal.
This post was edited by jlhromeo on Oct 23 2009 10:31am