Thank you for pointing out that "hole", because I hadn't really made the connection to high amount of tool use for goldsmithing to use of foci in magic. The reason he eschews foci are really two-fold, one out-of-story and one in-story.
The out-of-story reason is that the talented evocators we see don't really seem to use foci a lot. Neither Luccio nor Morgan utilizes them much in the books, and Harry says repeatedly that he uses foci for evocation because he's
not good at it. My character is a lot more like Luccio's precision strikes
in his natural element.
In-story, he simply never needed foci for Air evocation, wind and lightning both follow his will fairly effortlessly; it's really only Fire that is such a problem. (Mechanically, I've set his Discipline lower than might be expected, but instead he has control bonuses for Air and Spirit, this way Fire is drastically less controlled without his focus)
To him, the magic
is the tool; the result is like the jewelry he makes: beautiful and what he aimed for. Using foci is a bit too much "using one tool to be able to use another tool". He also dislikes being dependent on objects to control his magic, objects that can be lost. I'll have to think it over though, because you're right - there is a discrepancy there, so it needs to be sorted out...
For the staff - you're probably right that I'm making it a bit bigger than needed; a presence or intimidation maneuver is probably right for it, solidifying it as something that make others take him seriously.
Addendum: After thinking a bit about it, I've come to the following conclusion:
In goldsmithing, he uses his tools, to shape the raw materials (precious metals) into his desired result (jewelry).
In his arcane life, he uses his tools (magic), to shape the raw materials (current reality) into his desired result (the final effect of the magic).
Hubris? Oh not at all!
The fact that fire is so difficult for him, and that he has to use tools there, shines a spotlight on the flaws in his logic in disdaining foci; so far this just makes him dislike both fire magic and foci more, but as he matures a bit he might come around to re-evaluate his stance.
Does this seem a bit more consistent? It's sort of moving the out-of-game inconsistency into the psyche of the character instead, setting up future development.