The F18 is no different from any other boat in the fact that certain conditions favor certain crew weights- there is no way around that, it is just physics. Where the good teams win regattas is by staying consistent in the conditions that don't favor them, and absolutely maximizing their performance in 'their' conditions.

One of the most frustrating parts of the worlds for Brooks and I was not taking advantage of the light air last race due to a poor start. It was absolutely our fault for not seizing the opportunity in front of us.

That said, there are certainly weight bands that are good all-around performers, and for the F18 I believe that is in the 150-160kg range. For the East Coast of the US where it is generally moderate breeze, the lower end of that range seems correct. The European teams, and especially the Dutch teams, seemed to sail heavier (160kg) because they spend more time sailing in breeze.

As far as corrector weights, I honestly don't think they make much of a difference.