I love a these bikes; little difference responses, which are of coarse true. I can say that i used to race over 60 criteriums a year with light sew- up wheels i could stay in, and even place, but when ever i tried to race on the heavier clinchers i really could not stay in, let alone get a placing. As soon as i put the sew ups back on i was able to stay in again. There is an old saying that saving a pound in your wheels is like saving about 5 pounds in the frame etc...
Another thing i recommend is "pedal counting" find if this helps. Try pedaling super hard with one leg for 10 to 15 revolutions, as the other leg is not being applied, and when your count is up switch legs. good luck Brian