What you learn on a Laser or a
Hobie Cat doesn't have a lot of relevance on a 42-footer.
Item #1 is this: A Laser has no headsail, just a main, so a Laser doesn't teach you about "balance". If you find it hard to
head up in your
Jeanneau, it is likely because you haven't learned to handle headsails, and in your
Jeanneau you are carrying too much headsail for too long.
You have twin wheels positioned so far aft that you cannot conveniently reach the essential bits of running
rigging from the
wheel position. We can
work around that later :-)
On a nice day, say 12 knots (not 15, 12!), come to a beam reach. Now set your rudders midships and see what the boat does. If her
head falls off you are carrying too much head sail relative to the
mainsail, and you need to reduce area. Roll in the headsail until the boat, with rudders midships, holds her course without falling off or heading up. Mark that setting on you
furling line.
Now roll in some more until the boat heads up. Now gradually roll it out again until the boat holds course. That is the proper size of headsail for THAT wind. Other wind strengths require different areas of headsail, but we can come back to that.
If the boat holds course with rudders midships, you have a "balanced" boat. which is what you want. Hard to tell tho, with all that
steering gear! The
wheel will not give you proper feedback, but not much you can do about that, other than live with it!
The Jeanneau wants to sail flat, say 12º of heal regardless of wind strength, so play with the sail areas till that (12º) is what she heals. Your clinometer will tell you when you've got it right. Then muck about with the headsail again till she is balanced.
Now, at different wind strengths reduce TOTAL sail area, while keeping her balanced, by adjusting the area of the headsail relative to that of the
mainsail, until she stays within the target 12º of heal.
There is nothing to it really. You just have to stay focused on the physics of it. So keep a notebook, a "log" of wind strengths and appropriate areas of main and headsail for those strengths. Do that till you come to know subconsciously what your sail areas should be for the wind strengths you come to know by looking into the wind and feeling its strength on your cheeks and in your ears. :-)
All the best
TrentePieds