The think the ratio is still wrong. I would think that it would have to be about a 3:1 ratio and this is not even close. The concept is good but I would guess that the reason the new water bottle tests so well that it would make a round tube that is 1:1 become more like a 3:1. Just a guess.

Have an oval top tube that is around 70 -75mm tall and 25mm in width (just an example) but with the headset mounting near the bottle of the tube and have the other 2/3 of the top tube just behind the stem and run it back to the seat tube. Intergrated seat clamp and you would have a very smooth transition.

The issue with almost every aero top tube is that they mount the headset at the top of the top tube and not at the bottom to use the top tube as a fairing.

Maybe the new Cervelo P4C (hint hint) can have an aere top tube that flairs up right behind the stem and run back to create the most aero Cervelo ever.

How about incorporating a hydration bladder into the top tube to hold about 750ml.