Thanks for the report, DG. It's pretty much the same as I experience when I go back to my Cypress. On mine I'm 2-3 mph slower on average, and climbing becomes a chore.
But, when I ride it now, I ride it closer to its design intent, and I'm much happier on it. This is partly why I'm finding it difficult to part with even though three bikes in my 450 sq. ft. apartment makes things a little tight.
You make an excellent point. The Cypress is really more suited for my urban riding, but slower. I like the silky boost in speed on the Roubaix, but I do hate stopping at lights on it or going through all that junk on the sides of the road. The Cypress is slowly being converted into my errands bike, as soon as I find what I want to put on the rack for bringing home books from the library or a small amount of groceries or whatever.
I do have an N+1 "problem," but I'll post that on a new thread.