Using decades of racing experience (not all mine - I have had some great sail trimmers aboard including racer JonD and Quantum sail guy Dave Flynn) I can tweak my HR40 to about 30 apparent. I tack through about 90 true.
The biggest deal on my boat is using enough backstay tension to get headstay sag down to about four or five inches. YMMV.
sail fast and eat well, dave
beware "cut and paste" sailors.
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