I set my mk3 up a few years ago can't really remember what sort of day I set it up on??? But, In the winter below 12°c I add on 2 yds, below about 4°c I add on 3 yds.
From 13°c to about 21°c it's on the button. Then after that I take away 1yd for 2°c.
So by the time I get to about 30°c which isn't very often in sunny Wales I am over ranging about 5 yds.
FT WORLD CHAMPION 2016!!!