Would putting more time into refining the job listing help?

What specifically do you want? Why? Why will this particular hire help the organization accomplish its goals? What values does a successful employee need to have? Why would someone who fits the ideal candidate checklist want to work with you?

It’s a good question but I don’t think so, short of requiring a cover letter with the application but I bet I would face a similar challenge there.

The candidates and CVs do look like what I’m looking for, until I interview them …