They removed the perfect essence for focus. It now only applies to wand/staff. That makes ssf suck even more.
The clue is to find a +2skill focus of any kind, do a perfect or greater orb of augmentation. Then essence for cast speed. If you have cast speed and +2 skills, then you can just gamble with as fancy exalts as you can, you might get lucky and get spell damage, crit or anything good.
I think staff is better for ssf, it's only one item to craft. But you loose nice things like energy shield etc from focus. But the chance of crafting both a good wand and a good focus in ssf is very tiny
I played ssf in trade league up to lvl 92, but then I hit a wall and started to trade. It's sickening how much you loose when you play the proper way, which ssf is. Trade sucks, but you need it after a certain level.