Should I share high-fidelity or low-fidelity mockups with the team for improving current product experience?

I am at a startup, and we are all about 'budling the right thing fast rather than the wrong thing right.'

I am evaluating and improving our current mobile/tablet version of the dashboard. Would it be more effective to share with the team the high-fidelity mockups rather than low fidelity mockups?

and

How many times should I iterate low-fidelity mockups before proceeding high-fidelity mockups?