Hi Mark
Brian trained our birds on Sunday and to say the chuck was a disaster is an understatement - Cracking day, Healthy birds, a bit of a jump in distance but certainly nothing that could or should challenge them.
Yet many failed to clear your area and simply cannot explain it - The birds had only been tested that week and had been training and flying around home well.
Simply cannot explain it - I stuck my nose up to this ' K index' thing until Sunday but now think there is something in it.