We do the reverse 'bloggsy' heads sets on, seat upright & full harness on whilst the other CM is out of the pit of cocks. That way it lessons the chance of missing a radio call whilst say yr in a reclined position & therefor more relaxed.
I think common sense is needed in most of these scenario's. Turning the speaker volume up achieves nothing I believe in fact could be distracting.
Wmk2