Jeremy,
when you say "I'm not sure he was talking about whip tillering, which is a 20C phrase? From memory he mentions ‘whipping round’, and it's a separate action after shortening and pyking, all post shooting-in. a common practice seems to be having the bow 'dressed' after it was shot-in but maybe only for private, not livery bows?" what do you think he meant then?
When I read that part, as it was talking about "dressing" the bow to make it a fully finished bow suited to the archer it seemed to me that this was talking about fettling the tiller, length, strength and cast of the bow to suit the archer. what does whipping a bow mean? Binding with thread? I am sure there is wording that really does seem to talk about tillering and lighteneing the limbs to get extra cast.
Mark