Talk to Randy Smythe. He spec'd out some after market battens for my 6.0 a few years back. They significantly improved the performance of the mainsail. They middle 3 were somewhat similar to the stock battens. The top 3 were somewhat more flexible. The bottom 3, particularly the bottom 1, were much stiffer.

Or send me an email if you still have questions.

jamie.diamond(at)sailocra.com