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olskool said..
Benpei, check out Jem Halls setup n tuning on youtube. Roughly though, front harness position about a forearms length from mast, or 1/3 of sail. Rear line 2-3 hand spans from front. Harness length, so put your palm of hand on boom between HL. The line should then be firm around behind your elbow. That should give you a start. When using HL if front hand seems heavy n unbalanced then move front HL forward. If rear seems heavy move rear HL back. Keep tweaking n you will find the sweetspot. Go for it!!!
Rear line should be a lot closer. Having them far apart makes the sail hard to trim quickly and easily. Jem prefers them very close together but "you can move them further apart - a hand's width". Even with my 9.5, my lines aren't more than about 10cm apart.