I'm not 100% comfortable with the idea of having to buy the same upgrade multiple times. Taking Stress for using one, that's fine. But if the wizard wants to cast a huge spell, they should be able to pump up the Stress to make it happen. I do like the cap of Lore to keep it somewhat sane.
That would eventually mean, that additional refresh is somewhat meaningless, because you bought everything that is a part of the evocation power. It's the choice between free will and power, which is one of the concepts of the DFRPG, and I would like it to stay in there. It's the same with refresh now, I just structured it differently, so it fits the new way evocation works.
You might want to change "Massive Attacks" to "Massive Effects" to allow/encourage other kind of AoE spells.
That's a good idea, I will edit that.
I'm not sure about the Focus Item and Enchanted Item costing Refresh, since they're given as extras with the original cost. I do like the mechanics for them though.
I wanted to make them work differently. You can throw around free spells as long as you like now, which is a big advantage over the old system and warrants the loss of focus items on the baseline. They aren't really items any more, and a loss of them can be done by a compel on the wizard aspect. That means, that they are a flat bonus, and that means they should cost refresh.
Remember that they also cost refresh in the original version, if you buy additional ones with refinement.