the cross bike was on different rollers. These I just got and that's how they were setup by the shop. I thought the roller was supposed to be ahead of the wheel so I left it. I'll move it back one and see how it goes. It was really just the first minute or so that it felt unstable and then I regained my confidence.
I'm pretty sure I don't ride on-road with my back arched like that, it was just a roller thing. I'll try to get a better profile at tomorrows race.