An interesting development...
A couple quick notes.
Is "rune" not a single syllable as opposed to two? It has a mystical connotation. I think it is my fav of the three.
Vortex could have a negative connotation as it is associated with drains, tornados and used as "caught in a vortex".
Is the poll ONLY open to the three candidates?
Yes. The poll is open to 3 choices. You need to make the vote on the voting thread.

Although the technical fundamentals are mostly their - does this project actually have a clear direction moving forward ? Is a 2nd name change and re-branding really worthwhile at this stage ?
We have a VERY clear direction moving forward. The rebranding is the first step in that direction.
Its great that you were a fan of BoolBerry, but the name was been ridiculed in english-first language regions since its inception. The conotations of both "bool" and "berry" are cartoonish in english-first language regions.
Although "bool" has a meaningful technological aspect the pronounciation of it, especially when couple with "berry" left it sounding, to be quite honest, silly.
Although it might not seem fair, having a name that is brandable in English, first and foremost, is a very important consideration.