I really don't have any experience with an A-sail on a cat but have alot on sport boats (viper 830, J-105, Melges, etc...). Generally we always wanted to go to full hoist on the halyard, but then would play the tack line to adjust luff tension. The more of a reach, the more luff tension. What was really surprising for us was when we were running deep, we'd ease the tack line a foot or so and this really helped rotate the sail out to windward and make it act more like a symmetrical chute. In heavy air, we would ease it about 2 and a half feet and this really helped lift the bow and get the boat flying.
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<br>Not sure how all this applies to cats, but would be very curious to find out if the lift will help counteract the boats tendency to bury the bows.
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<br>TB
<br>Tornado USA655<br><br>