As you are in search of something narrow & flat, I would add Prologo Zero to the list. Although if weight is a concern, Prologo will disappoint as even the higher end Zeros are about 200g. The Zeros are 134mm wide, should suit a rider with narrower than average sit bones.
My road bike saddle choice has evolved in five years like this:
- Specialized Toupe basic model (some skin irritation, no numbness)
- Tune Komm-Vor (fine for rides under 1,5 hours but generally quite uncomfortable on longer rides as I got back pain on top of general discomfort from sitting)
- Specialized Toupe Expert (same issues as before on Toupe)
- Prologo Zero Nack PAS (fine for rides under 1,5 hours but on longer rides discomfort around sit bones or numbness depending on riding style)
- Fizik Antares R3 (for testing purposes) and quickly after R1 (when riding dynamically, ie. getting on the top tube regularly, no major issues but some minor occasional skin irritation)
So far, for me the Antares is the only one I would approve for consecutive long days on the saddle. Originally, based on product pictures, I thought Fizik saddles would never fit me. I came across the Antares on a rental bike during a cycling holiday, and may have found the best (but not perfect) saddle for my sensitive ass.