Dylan from Assembly here. If you want to send me one of your audio files (my email is in my profile) I'd be happy to send you back the diarized results from our API.
You can also signup for a free account and test from the dashboard without having to write any code if that's easier.
Other than lots of crosstalk in your group conversations - is there anything else challenging about your audio (eg, distance from microphones, background noise, etc?)