After hoisting the pole will be pulled back so that it is perpendicular to the wind. The sail should be sheeted so that the luff is nice and stable for cruising – slightly over sheeted. Sheet in so that the sail fills and is stable, then ease until the luff starts to curl in. As soon as this happens stop easing and sheet back in a few cms.
If the foot is tight on the forestay, ease the guy a little to move the pole forward.
With a asymmetric or gennaker you can fly the sail with a pole or without. A pole does give more control, especially if going low, and in seas. But it is difficult to rig up, and many boats do not have the crew or gear to do this. Trimming with a pole is much like everything we have discussed before, allowing a little more overtrim than when racing.
So with no pole, and no big long bowsprit, then the sail sits on the centreline, with not a lot of separation either. Whilst reaching no there will be no problems, and when the pressure builds, the boat can be headed down. To get lower, to make a course, then there will be an angle, depending on the wind speed, that the sail just will not fly well, and you only get one clue of the problem – you can hear the sail fluttering, but you cannot see it – its the leech, as the wind hits the leech from the wrong direction. You need to come up!