I think salvaging only level 60 items will potentially quite a bit of time to your run if it can be made, especially as the price of essences and tears come down it's not really worth it. I custom loot and just turn off looting magic items. In 8 hours you don't get that many of the level 63 affixes. By the way do you find custom looting takes a bit longer than regular looting? I'm not sure if I'm making my png's correctly, seems to take 2-4 seconds just to go through the custom loot code.