The chaotic nature of the conversation is probably part of the problem?
You don't need to hear everyone in the VAR set up at all times. The main VAR just needs to be heard communicating what is being seen to the ref, and if the ref then has to review, they explain what they are then seeing and what decision will be given. For offsides, the main VAR would just go with "We have got a decision, that is offside/onside".
Chaotic nature of the conversation comes from "Hiya mate, yep check all good, we've done this well, proper good. Matty is happy, Jonesy is smiling as we nailed this one mate"