2H does not increase the damage of Tenebrium enchanted Weapons, you need to improve your Tenebrium Skill instead. What do you mean with "Weaponmagic"?
At the risk of repeating myself: everybody should have Glass Cannon. Unless you are playing on hard you don't even have to take any additional actions to increase your HP. Mandora's 8 AP (walk +1 attack) would turn into 16 AP to walk and attack 3 times.
