And what with the high end? Is it real? Pretty high for a 12m kite...? I would expect rather 21-22 knts.
As dyyylan sad, it depends of raider weight, board, and your tolerance of being overpowerd. 60kg raider might struggle in 20 knots, a 120kg raider might still be comfortable riding it in 25 knots. You gain 1 knot in low end you lose 2 in high end,...
But envy do have a wade wind range.