I have a DS and did 100 miles earlier this year with a couple of friends on road bikes their bikes did not climb any better and did not go any faster... trust me when I say it is not the bike it is the engine, you simply need to condition yourself better. It doesn't help that the people on the club ride are probably ALL avid riders and well conditioned, whoever invited you really did not consider your riding level or maybe you over estimated it.
Fact is you really need to be TOP shape for to get any discernible performance improvement in switching bike. Another member here posted his speeds with his own TT bike, road bike, and hybrid, the difference is not big enough to matter unless you are really in a professional athlete/race type of conditions.