Differentiation between title and author needn't be handled in any way other than using different sizes, and often even that is unnecessary. Unless your book title is a person's name there would be no confusing between what is title and what is the author's name.
Looking at the site, you're right, Ailerons is for personal use only. That was a bad suggestion, apologies. Though I would say you don't need a "sci-fi" font, a simple sans-serif will do the job perfectly well - especially a geometric like Futura or Gill Sans if you can get your hands on them, otherwise fonts like "Moon"
https://www.behance.net/gallery/23468357/Moon-Free-Font or Manifesto
https://www.behance.net/gallery/21065399/MANIFESTO-free-font can give the same effect. Fonts with near-perfect circles for "o"s are the ones to look for.
If I were in your position, I would steer clear of the typeface you're using as it somewhat forces you into certain lock-ups - for instance, the faux italics centred would look garbage. Chances are your image will be more than sci-fi enough, try and go for a more professional typographic look - after all, the most important thing about the text on a cover is readability.
As far as the brackets go, it's not poor form to use spaces or half spaces between bracket and text. If you would like to use them but find it difficult to read, that is an option. Though with a better selection of typeface it is unlikely it would be a problem.
Finally, careful of leading. In that final option the "We are" and "Legion" are too close together, it's uncomfortable. Then the "We are Bob" is too far away to be part of that title and not far away enough to be a subtitle. A consistent leading between title text would come across much better.