Shift up a gear or two in the middle of a sprint.

Oh, that's right - I don't sprint.

As for the Sagan tuck (and all other extreme descending measures) - Those guys are paid to go fast. It's their job. But it isn't my job, and there is a very good reason for that. The point is, they ride for pay and I ride (slowly) for fun. That changes the risk/benefit analysis quite a bit.