Agreed. The end of inflation is the initial condition of omega=1. At that time the universe was half matter and half anti-matter. Most of that mass disappeared at annihilation. But according to general relativity, omega had to stay very close to 1 for the universe not to immediately collapse or expand away before galaxies could form.

The only out I can see is that at annihilation, most of the resulting energy went into dark matter rather than light. But that still does not explain how the visible mass omega got to be so high > 1/100.