Ummm, I'm surprised the seams are only double stitched. Most of the off-shore sails I've seen are triple stitched, not double.
Hood goes with glued and double stitched and the only failure I've had from a Hood sail over the years - and that was in a Force 10 storm, had nothing to do with the seams. If you've ever handled a Hood sail - even a 5-10 year old one, you'll be amazed at the difference between it and other sails.
s/v Paloma, Bristol 29.9, #141
Slipped in Bahia Marina, easy access to Corpus Christi Bay and the Gulf of Mexico.