Is picking small b2b SaaS companies as my target market too vague?

So, I am planning on doing customer development interviews with small b2b SaaS companies, but that still feels a bit too vague to me. My worry is if I interview 10 founders of small b2b SaaS companies that I'll get 10 different problems to solve. So, any suggestions? I'm planning on using "the mom test" and "talking to humans" as my guide to helping me work on my customer development calls.