I don't. I think "evil" is an abstraction; as you said, political, though I would argue more connected to moralism. Perhaps not, I've never actually read all of Stirner, and I am not big into explorations of evil. Boring.
What is evil is in the definition of whoever wields it, or, perhaps more properly, whoever wields control of the social/moral narrative. I think anarchists embracing evil as some sort of opposition to the social good is reactionary, as is trying to reframe society as evil and anarchy as good. I'd rather just reject both good and evil, or strip the social meanings down to nothing.
I don't know if this undercuts what I have written here, but I do talk about myself as being terrible, sometimes horrible. both are value-laden words, but to me there is some distinction. If someone calls me "evil" I want to punch them in the mouth (this ain't no D&D game!), if someone says I am "terrible," I smirk and agree.