Keep riding. You lost just about half the weight of your mountain bike by switching to a road frame and set up, maybe more. Most likely your mountain bike weighed at least 30 pounds. So compared to the 16 pound road bike with fast rolling smooth tires your mountain bike was a tank. Especially if you tried to ride it on the road. Just remember each kind of bike is designed to do that one kind of riding the best. A mountian bike for off road riding and a road bike for pavement.