Maybe try going it alone. I know it's counterintuitive but sometimes building something by yourself is the best way to find a co-founder who's actually any good. I never would have joined the current project I'm on (which is going really well) had the designer not come to me with these amazingly beautiful mocks. Before working on programming projects I had similar experience with music projects -- I'd be trying to put a band together to write songs. I learned that it's a lot easier to get people to work on your projects if you've already started them. Incidentally, it seems to be the same with investors, employees, whatever -- they have the pick of the litter and they'd rather not be first money in. Everyone wants to feel like they're getting a deal and everyone responds to FOMO.