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LeeD said..
My foil boom height, seat harness, and line length is identical to my freeride kit's.
Only change is harness lines 4" farther forwards.
While the 4" (10cm) move in harness lines may work for you, I'd caution others not to move them too far forward. While it's true that foilers tend to have less sail pressure and can move the lines a bit forward, with big sails or stronger winds, the harness lines shouldn't be too far from where they are normally.
If you place them too far forward, during a gust, the sail will get more back hand heavy. The way that most windsurfers counter that is to pull more strongly with the back hand which then tends to load up the back foot which then tends to load up the foil. In short, gust hits -> foil gets loaded up. Not what progressing foilers may want.
To the broader topic in this thread: +1 on the waist harness. Bigger sails use the same harness lines or longer with my biggest. Takes a while to get to that point, though.