I've decided on a priority of Hit > Exp > Stam > Mastery, because the value of mastery is reduced when I use shield barrier all fight long.
Is it worth me gemming stamina, if I can maintain my Hit/Exp caps with reforges, or is more points from a secondary stat gem better?
(Gems have 0.75 the stam as they do mastery.)
Also, will my shield barrier improve due to higher vengence?