I had lots of saddle sore issues with my Terry Butterfly as well. I went to a Selle San Marco Atola Gelaround, and I love it. Equally important were:
1. Consistent, generous use of chamois butter (or udder balm)
2. Washing the sores & whole crotch area after every ride, and then applying either hydrogen peroxide or alcohol.
3. Using antibiotic cream (OTC triple antibiotic) on sores, open or not.

When the sores were bad, I did the alcohol/HO and antibiotic cream several times a day. And a 2-3 day hiatus from riding helps, too.

Good luck!

S