I went from a bulky hybrid... to a fast hybrid. 7500FX. (Now a 7.5 Fx Trek.)

However, you *do* feel more of the bumps! I still go back to my even bulkier hybrid for multi-day rides.

And... if it doesn't feel good riding it, I would not buy it. IMO it's like shoes. If they don't fit now, at least for me... they don't break in, they just break skin. HOWEVER!! If shorts made that much difference... go with your gut -- but NOT with "Okay, I'm supposed to be on a road bike. It's what other people ride."

I LOVE passing roadies on my hybrid The tires are skinny, it's light, and if I hunker down it's almost aero. And since I ride Bulky Bikes usually, I take off on it