Re polyamory, it's a good topic to bring up when people are already involved and understand the basics. It if comes up first thing, they label you as swingers or some other "weirdos" and lose interest.

Re tone. Here is your mission statement:

We empower individuals and organizations to refine and reach their goals by transforming recent research on rational thinking and emotional intelligence into practical and easy-to-use strategies and tools conveyed in a friendly and engaging manner.

Or, in other words, "we dumb things down so your simple minds can understand". For comparison, CFAR's vision page , while it also could use some improvement, says stuff like

Even the smartest human brains didn’t evolve to handle the kinds of complex decisions we face daily in the modern world.

and

We’re taking the results of cognitive science research, and turning them into techniques that people can practice and use in their own lives. That means going beyond understanding these errors, and actually training ourselves to overcome them. It also means knowing when to trust our instincts, and learning new thinking habits for situations where they’re less reliable.

The difference may seem subtle, but they include themselves in the group that is learning, not just teaching.