What country are you in?
If you're in the UK try giving Matthew a call at Demon Sails.
He can make sails to your needs and there is no doubt that they are durable.
However, I have owned mant Tush sails including the 9.4 and all have been roughly treated. I've never had to tape a single one even if I have creased them by mistake. I wonder if it is something to do with their storage or rigging that is causing the problem.