The hull bouyancy is marginal for the 15m main, yes I can get my lardy 95 kilos out on the wire to compensate but all that will do is sink the hull further creating wetted area and drag which means slow. So much better to reduce sail area and let the hull ride in its optimum level.

Certainly proven with my current boat, having gone from 13.5m sail to 15m sail and then from 2.3m wide to 2.5m wide, I think the smaller sailed narrower boat was faster other than in light conditions.

But Mecca I'm sure you will tell me that I am so wrong