Re: 125-140% genoa
I bought a new Genny from National Sails (http://nationalsail.com/) - they order them from Thailand through Rolly Tasker. I am happy with the cut, which is around a 138% - maybe a bit more - but with a higher foot than is typical, so I can seeforward, under. Not, I am not a racer.
The dimensions came from the Kevlar sail I was replacing and were: luff - 38' 9" Foot -20' Leach- 37' 8".
In hindsight I could have extended the luff by another 8 inches or so but I like the way it rides as is.
Not sure if this works, but I am attaching two pics showing the bottom cut of the sail and how it rides on the furler.
FWIW