Mike - How do you come across these slack groups? I am an investor in self-funded searchers and would be great to connect with anyone looking for strategic capital.

I'm in two and they're both for searchers only to help each other with the day-to-day struggles of searching. If you're looking to invest, I'd say you're in the right spot because this is one of the places that searchers look for bankers and investors.
Ways that I've seen investors get their name out is by hosting information sessions and offering free advice on forums like this one. That gets you a network and then when someone needs capital, you're the first person they call.