Thanks for the replies..
Appreciate the input here. No, this isn't a racing boat and neither is her skipper a racing sailor. Also, I doubt if any substantial roach can be added due to close proximity of the backstay to the head of the sail. I think you guys helped me make a choice - the factory design was 3 partial battens - although that was from 25 years ago. I'm likely to go with the same, at this point.