As said, see now part 6-10 of the slalom / race Tips of the 0,7 squad:
6- The fin spins out:
Move mast foot forward: this reduces the pressure on your back foot that otherwise pushes your fin into a spin out!
Move your foot straps one hole forward, but bring back the mast foot by 1 cm: this decreases the pressure on the fin.
Use a 2 cm longer fin. It will hold more pressure from your legs.
Change the fin if you still have problems.
7- The nose of the board lifts up continuously?
Move the mast foot 1cm forward; The weight of the sail will keep the board down.
Lower the boom; This will help the sail to stay upright, more at a 90 degree angle to the board, and this allows less power, less lift which can be good to have in lighter winds, but not as the wind increases.
Decrease the fin length by 2 cm.
Release the downhaul by 2 cm; lesser loose leach will lower the trim of the board in stronger winds. It will offer more control in very strong winds.
8 – The board is glued to the water:
Move back the mast track. The nose of the board rises.
Raise the boom by 2cm: This creates more pressure through the legs on to the fin by keeping the board more on the rail, and the board nose rises.
Use a 2cm longer fin: A longer fin gives more lift and allows you to put more pressure on your legs.
Shortening the Harness Line will help in the same way as raising the boom height.
9 - Not able to close the gap between the sail and board?:
Move the mast foot forward. Closing the gap will become easier
Lower the boom. The boom has a shorter distance to travel in order to close the gap with the deck of the board.
10 – They are faster then you??:
Do you have a slalom board and sail? If you do then read the points from 1-9 very carefully and trim you gear.
Remember that slalom sailing is not just hanging into your harness and relaxing! You will need to be slightly overpowered and push the board to the limit without any fear.
Be ready to change your settings as the wind intensity changes.
Strong winds:
Longer harness lines, mast foot moves forward, smaller fin and lower boom.
Light winds:
Shorter harness lines, mast foot moves further back, longer fin and higher boom.
Find the right compromise in order to be the fastest one out there, and always try to keep some pressure on the back arm in order to have this extra power as an accelerator when needed.