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Simple answer .... the tack height should be set to that the sail is at its most STABLE setting. If its unstable, or grossly unstable .... you can wind up with the kite tightly wrapped / hourglassed around the headstay, etc. within the blink of an eyeball. Proper setting helps avoid this.
For Cruising you can 'conservatively' set .... low tack; and, sheet pulled in more than normal ... but then the leech can become unstable and the sail become easily 'backwinded', etc. because its now 'powered-down' and somewhat flattened.
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