I have a thought or two on the bottle situation. I went with an aero bottle on the downtube to stay as aero as possible there. Once you go aero, you can't switch out bottles on the course, so that's my liquid fuel bottle. The air behind
that is a little bit "dirty", so then I decided to put a round bottle holder there on the seat tube. When you combine the round bottle shape, the seat tube, and all the crap behind it, that's a rather long area and the round bottle isn't such a penalty. And that gives you a round bottle cage to take on more water course water. When you look at it from the top, it creates a very long teardrop shape.
Personally, I keep a round bottle full of tire kit changing stuff there on the down tube and then stuff course water in the back of my tri shorts, Faris-style. Not sure if that's more aero, but it's fun racing like The Furry One.
Another thing I figured out - You can take a small roach clip and pinch the very end of a classic Bento Box to give it a tapered tail. Works great.
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