Mike,
I know weight loss is your chief goal. But, don't forget your leg muscle is stronger, your lungs have become more efficient, blood pressure may have dropped, joints are stronger and more resilient.....and your heart muscle stronger as well. Shaking up your routine certainly can't hurt. A longer weekend ride, little "intervals" relative to your fitness, recovery rides, etc. And try to keep patience and faith in the natural law that fat will be hunted down and consumed by its age old nemesis: controlled calorie intake and increased calories burned. Somewhere, fat is cowering as it hears refrigerator doors being shut firmly and the oncoming hum of clinchers on pavement.