In article ,
writes:

Hopefully I use the correct terms in my description.....question:

1) Do the values I obtained (at bottom) for Radius of universe vs
age of universe look about right?

At first glance, yes.

It appears that after inflation,
the universe has only about doubled in size, if so.

The calculator has nothing to do with inflation. At the end of
inflation, the currently observable universe was about the size of a
large beach ball.

2) If I understand right, by using Omega_M + Omega_vac = 1.0,
I have picked a flat universe. What values could I plug in and try
so that the co moving radii reported by the calculator reflect a
current best guess for a Dark Energy inflated universe?

The standard model of a flat universe with a cosmological constant (dark
energy) was determined essentially by doing what you are trying to do;
it is not an assumption but rather an observational fact.

Clearly, when the universe was only 0.721 Gyr old, we could not see
(from earth, if we were here back then) objects that were 13 GLyr
distant as light had only been travelling for 0.721 Gyr. But the
objects we observe today, were still out there, beyond the veil of
the CBR, when the universe was 0.721 Gyr old..............same goes
today....there are (most likely) galaxies out at 15 GLyr distance
but we won't see them for another couple Gyr.

Right.