for some of us the LongFast Default is too congested. Messages don’t get where we needed them. Meshtastic had a great blog post about if LF default is holding back the mesh in your location. https://meshtastic.org/blog/why-your-mesh-should-switch-from-longfast/
The Medium Fast setting didn’t have the range for the testers. Lots of isolated locations. We still have more testing to do rest of the month.