I want to thank you for your insightful comments on your experience. I should explain that my perspective is more academic (I don''t have any experience with this type boat). I would expect that the wrap around sails would be a problem along the lines of your comment. As for the performance and the balance issues, I am puzzled by the continuing popularity of the Nonsuch. If anything, I would expect that the split rig would be better from a balance standpoint than having all of the spar weight and sail area in one place.
Thanks much for your reply.