Le groupe de Ben Gagnon

I am currently building a small portfolio of niche websites and I'm looking for a better way to search expired domains without hitting a wall. Most of the tools I find either have terrible filters or they don't show the full history of the domain's previous use. I’m really worried about buying something that was previously used for a gambling site or something else that would make it impossible to rank on Google. How do you guys manage to find clean, powerful domains without spending all day on it?