1) You can loosen the rudder in the casting simply by loosening the through bolt that secures the rudder (the same bolt that it pivots on).

2) Class legal purchase on the main sheet is 7:1. I have 7:1 on my 6.0 and need more (class legal on the 6.0 is 8:1).

3) Boards go all the way down (to the stopper rope) while sailing upwind. Bring them about half way up for sailing downwind. You may find it usefull to use a permenant marker and put lines on the daggerboards to reflect these positions.