Hi Baltic
when I got my new Landy main earlier this year he sent me some crib notes that touched on the dagerboard settings and are as follows; - " The capricorn itself is a little unusual to sail downwind. the Centerboards are very sensitive. Unless it is blowing 20 knots, never lift the board more than the V cut out in the board. 10 - 12 cm is enough. Any more and you are slow. The boat is so boyant that it need most of the board to lift and go forward."
Cheers.