Chevvron,
I personally think that if you are mandated to say Hectopascals for some circumstances then you might as well say it in every instance. It then reduces the chance of forgetting to say it when mandated and getting screwed over for it of you have an incident...
Talkdownman... as a CAPC I would be very pee'd off if a UCE behaved like that and would encourage any controller to challenge such behaviour and would support them to the hilt. in no uncertain terms