BRIAN HANCOCK REPLIES
Yes, you should adjust the tackline for different points of sail and different wind speeds. If you are on a reach, you want the luff of the sail to be fairly tight, so crank the tack all the way down to the sprit. This straightens out the luff and brings the draft of the sail forward, which is what you are looking for. As you bear away toward a run, however, you want to be able to rotate the sail around to windward to make sure it gets plenty of clean air. So ease off the tack and let the sail rise up a little. That said, if you are sailing deep downwind in quite a lot of wind keep it cranked down. You want as much control over the spinnaker as you can get, and tightening up the luff will help stop it from oscillating to a point where you could get into trouble.