It took a few hundred miles for me to realize that after 30 miles or so I would *always* get cranky. I went back to hybridville. I have a 7500 FX that goes as fast as I need it to (probably exactly one titch slower than I could do on a road bike).
Maybe another year's worth of yoga will do wahtever my core muscles need ... I suspect that is the root of the problem. Something about what I have to do to hold myself at that road bike angle makes me feel out of balance, which makes me cranky.