I would be open to a removal of sailcloth restriction for the main, although I'm not 100% sure the added shape retention is worth the added cost, especially with all the tweaks available for the main (outhaul, downhaul, vang, halyard etc....
The J/30 Class Association has partnered with West Marine and is now a member of the West Marine affiliate program. You can support the J/30 Class when you make your West Marine purchases online. The J/30 Class Association receives a percentage of sales from your purchases when you click through from our website. Click the logo above and you will be directed to the West Marine website with a cookie that identifies you as a J/30 affiliate. You can also use any discounts that you may be authorized.