If you have the men's saddle, it's either 130 or 145 mm. Either would be too narrow if your sit bones are ~150 mm. Looking at the dimensions diagrams, this saddle looks pretty pear-shaped to me.

http://www.4za.com/saddles/stratos

I think the Brooks is considered more t-shaped.

The SI Diva looks to be 160 mm, which would probably be better for you, but may be too wide (which would cause chafing). But the only way to know would be to try it.