I think Wolfram is the clear choice!
It’s my favorite of your list, and I love the name, but that’s not the only reason why I say this should be the name for you.
I think it’s the name that falls right in the middle of accomplishing everything you seem to want in a name. The fact that you have two names beginning with wolf and the name [name]Fox[/name] on your list suggest that you really like the idea of calling a little boy by one of these animal-inspired name (I do too!). The wolf and the fox are similar animals in many ways too - similar in looks to the more domesticated cats and dogs in a way that makes them almost cuddly and endearing, but at the same time dangerous and wild in a way that makes them mysterious and adventuresome, cuddly yet adventuresome being almost exactly how you would want to describe a little boy, but somehow fitting for most grown men too.
Anyway, after that long digression, I think you definitely want to keep one of these names to keep that animal-inspired name/nickname for your son. If you use [name]Atticus[/name], you lose that, so to me that makes [name]Atticus[/name] a clear loser here.
On the other hand, the fact that you like [name]Atticus[/name] suggests to me that you are also drawn toward traditional (albeit uncommon) names, and all the classic charm that comes along with them. This, to me, is why [name]Fox[/name] likewise won’t work for you. It’s just not a name-name in the estabished sense, and it invites a more modern-sounding vibe (due to the sharpness and brevity of its sound and the fact that is a surname) while losing much of the distinguished and genteel feel of the other names on your list.
That leaves [name]Wolfgang[/name] and Wolfram. I happen to think that even [name]Wolf[/name] alone could work, as, unlike [name]Fox[/name], it has a more solid history as a first name and sounds softer and more studious, but I love the idea of a longer version to give him more options and because I also think that when in doubt, a name with more heft and weight will usually feel warmer, which I think is part of what you’re going for.
As between [name]Wolfgang[/name] and Wolfram, I like both, but I think Wolfram has so much more elegance and style. [name]Wolfgang[/name] feels flashier, a bit more overdone, and its harsh ending invites him to almost always be called [name]Wolf[/name] by anyone who has met him more than once. Wolfram, on the other hand, is quietly unassuming, but strong and dignified. I could see a grown Wolfram being called Wolfram in a way that commands respect without being arrogant or in-your-face. Its the kind of name that makes me think of a person who is popular and well-liked wihtout being aggressive, someone who can stand in the corner and not push his way into the center of the room but will inevitably end up being in the center of the crowd anyway as people are drawn to the corner to be near him.