I'm firmly in the lighter and more road bike-like is faster camp, but I owned both an FX 7.2 and a DS 8.3 and found my DS to be faster. I couldn't for the life of me figure out why I would see consistently faster average speed times over the same course on the heavier DS 8.3.

I ended up trading my FX on a Secteur (which was faster than either) and then finally traded my DS on a Roubaix which is the fastest bike I've owned. I found the road bikes to be much more comfortable and efficient than either of the hybrids.