I'm in the process of ordering a screecher which will be mounted on the prodder of my Privilege
435. I have a continuous line furler
and will have a UV strip on the sail. The sail makers have recommended a .75oz nylon.
As a cruising boat, I'm more concerned with longevity and price
before any serious performance considerations. My asymmetrical is .75oz but this seems a little light for a screecher which, knowing my sailing capabilities, is going to occasionally rub on the spreaders and all the other things on the pointy end of my boat. I realize though that this is a light air sail so maybe .75 is appropriate.