I beg to differ Urs. In design, there are a lot of rules that you have to balance between each other.
So, you can't say: symmetric is good; we do symmetric; so all is good. You have to balance a lot of principles, which are often even in contradiction .
For me it's also not only about the shape but also about the placement of the Hexagon that forces all other elements to flow around it. In that respect, I follow Bones (and you) that making it a square would not resolve all issues. You'll would still have the same problems as Dune and Sylenth1. But the edges of the hexagon result in even more cramped spaces.
Screen eye movements concentrate on top and left positions. That's not where I would put the FX section. It's much better placed at the bottom like in Repro. But I like what you did with the fx section, given the constrains you've given yourself.
But I know enough about management decisions to know that they are not always taken on logical grounds. And there are a lot of decisions to be taken in a project. So, once you have, you have to move forward. So I totaly understand, once you have decided for the hexagon design, you have to stick by it and just move forward. Still, I encourage you to try a different design as well, when time allows it.