How do you adjust batten tension? Mine are all full and seem shoved all the way in the slot with velcro on the leech.
This is a good learning experience for me, I like the idea of a raised clew cut foot sail as mine is also close to the bimini.
The battens on my Quantum main have a screw on the end that adjusts the length. I will try to remember to get a photo when I adjust them. Not sure how it works, I think it moves the batten end cap.
I offered a copy of the manufacturer's sail plan to the sailmaker who made my main and jib. He said he didn't need it, would get his own measurements. The main was a foot short, too long on the boom, and the clew was way lower than the original. He did add a panel to increase the height, but that just screwed up the sail. The jib has never been right, either. He did come out on the bay with me and look at all the problems. Said there was nothing they could do about it, because the boat didn't have a backstay. Like I kept that a secret from him or they had never made sails for a B & R rigged Hunter of that era.
This Hunter sail plan shows how the boom should angle up to give the arch plenty of clearance.
I have the rig tuned and checked annually by a local company that seem to be expert with B & R rigs. I've got a good 4 to 5" of prebend and the leeward shroud doesn't show slack until pushing hard in 15 to 20 knots apparent or so. I'm always telling the crew, "when in doubt, let it out". If I let the main out too much, it's backwinded by the jib. I let the jib out far enough to not backwind, I lose the telltales and the jib luffs. A 340 with standard main is tough to trim and balance upwind. The jib is only 108% and the 16' boom and big roach puts a lot of sail area aft, so you have to keep the jib driving hard to minimize weather helm. I keep the main halyard and the cunningham tight to keep the draft forward to help balance, but that makes it even easier for the jib to backwind the main. But, on reaches, she's very easy to trim and sail. The sail plan works better with the roller furling main rig.
I have looked back at photos from the last year or so, and the leeward curl started small and has been getting worse, like something is stretching or fabric is failing.