Avatar of Fire - Physical Runes or Soul Core Elemental

Warriors, i have question. I use Avatar of Fire, 75% convert from physical


Greathammer
+20% quality
Physical Damage 223-302
Fire Damage 31-61
-
98% increased physical damage
Adds 31 to 61 Fire Damage
111 %increased elemental damage with attacks
+6 level of all melee skills
Leeches 7,22 physic as life
Gain 40 life per kill

2 empty sockets

Still empty sockets - is better to put 60% elemental damage or 40% physical? Also i'm running with Magma Barier buff, that deals fire damage and i igniting mobs too. It will scale from elemental damage with attacks? Ignite will scale too?