Ah! I didn’t realise that it was using the average speed for the pointer with WD. #-o
The intent was always to use the “latest” instantaneous value - this is what I set it to do with Cumulus anyway. That is a simple change, it just needs a tweak to the tag file, and is something I will make to the released version. To save me looking it up 
What tag should I use to the latest wind speed value?