You may want to ask this over at the Antique Roses forum, there are plenty of folks there who grow "no spray" and can help.

I love Duchesse de Brabant, and I won't spray. As you know, Mme Joseph Schwartz is a sport of Duchesse. It could be my imagination, but I just didn't like Mme Joseph as well. It truly seems like a "weak sister" to me - in fragrance, disease resistance, bloom fulness, everything. I finally got rid of it in favor of a rose that would reward me more for the space it consumed in my small garden. Oh and it seemed to ball in humid weather worse than Duchesse, too. I think that was from the thrips. In color it was cream for me, and rarely showed the pink petal edges that the photos show.