'Culture fit' is one of the most abused phrases in hiring. In practice, it usually means 'reminded me of me.' That is not culture. That is a mirror.
Trade fit for contribution
Instead of asking whether someone fits your culture, ask what they add to it. Define the behaviors your culture actually rewards, then hire against those, not against a vibe.
Questions worth asking
Tell me about a time you disagreed with a decision your team made. What did you do? Describe a working style that frustrates you and how you've worked with it anyway. Walk me through feedback you received that changed how you lead. Answers to these questions surface behavior, not personality.
The bar to hold
If you cannot describe your culture in behaviors, you cannot hire for it. Get that clear first. Everything downstream gets easier.

Erika Hebert