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I had a dynamic in my hand in the bike shop, it definitely felt narrower than a pro, at the front where cutout is and at the back. Though as Ed says, you sit differently on them, so the widest end doesn't matter as much as "normal" saddles, the tapering etc. does.
Have a read here, there's a picture comparison with your superflow and noticed how it shapes differently :)
http://biketestreviews.com/saddles-part-5-selle-italia-slr-superflow/
im was on a 140mm slr super flow, which is the widest saddle I had tried and was the most comfortable saddle I managed to find thus far. (still makes me numb after a while)
My smp is the dynamic, which I think is one of the wider ones?
@edscoble
I feel fairly far back on the saddle already, just some of me seems to be resting on my upper inner thigh near pelvic bone but not quite..