With a high level char you would be doing 90%+ deadly strike with WitchWild so maxing it out wont really b a great help. I dont know about relying on magic arrow with WWS to kill physical immunes coz theres about 20+ packs of monsters everywhere with that mod. Sif you will shoot each monster with 1 arrow. I'd say put points into your passives or frozen arrow and its synergies.