I would immediately get rid of the warning for unstableness in both projects. They are simply unnecessarily self-deprecating and "stay away" markers. When would you remove them?... I don't know your projects, but it's incredibly unlikely that they are worse in those regards than basically any other software project. It's always the user's fault if they use some unestablished thing in production, you're not responsible for that and have to help them learn that.
Being experimental can be expressed through a 0.x.x versioning scheme. Having bugs is expressed by the issue tracker, and in any case not unique at all. Incomplete features is something anyone will see if they decide to try it.
The chat thing seems like one of a million chat things, why is this chat solution better than any other already existing one? Needs to be clearly expressed as the first thing. tool like this suffers from adaption usefulness, it's only useful if people use it, why would you use it if no one uses it.
The other thing looks very niche, so also not surprising that it's not used that much.
I don't know, I wouldn't worry about it that much. Kind of confused anyway why you'd "look for" contributers. Seems kinda like you want to simply get a following for ego reasons or something.
True, but that isn't really very unique to the US