Boon of the Garou damage
 

Does anyone know how many hp the life tap is for?

30hp i think

Does a pet with 2x Deadwood Stave proc these, or do the game mechanics force the pet to use only one source of procs (be it the buff or wielded staves)?

Should proc them all, otherwise Rangers would be worse than they are now (Call of XXXX buffs).

Boon of the Garou damage scales depending on the level of whatever you cast it on.

As far as casting it on my charmed pets ive seen 27-29. These are all under level 60 obviously so it stands to reason a player may get 30 or more.

33hp proc when someone buffs my Warrior with it at lvl57