Road bikes are basically pretty similar. The weight differential between two bikes isn't huge once they have a rider, and it only matters on hills. If you really want an order of magnitude more speed, you need a motor.

PS - thanks for sharing your data. You ride a lot more than the average bear and have a treasure trove of info. It's one thing to read an industry white paper, but real world experience is a lot more relevant to 99% of us.