I've done that Joe, but have left that out, forgetful I suppose:-)...... good point.
Now I think about it, it does not pearl nearly as much (although there is a good amount of pearling still).

This seems to give credence to the idea that exposure by gas phase will give you an increase in pearling/O2.

But a temporary spike of CO2 vs a continous observation like with mist seems to be the real question. You can easily get a nice pulse of growth, but be unable to maintain this same growth rate/momentum later.

If we do back to back water changes each day:
Say 60% one day and then observe, then repeat again at 60% and observe, we can likely make some more conclusions.

We can rule out weekly organic build up(we can also add purigen or Activated carbon etc and this also improves growth is many cases).
This needs ruled out as well.
Converting more of the nutrients to the inorganic phase may help increase pearling.

But the real issue is how long can that intense pearling occur?
Every day for a week or two?

What is it about a water change that causes that intense pearling?
Is it really the degassing water?

I do not think so really, in some cases perhaps.
We can blast CO2 for an hour at high levels and notsee the same effect.
So CO2 alone cannot account for it entirely it seems.

As far as night time, well, there's a lot of bacteria, and murky water really shouts out high loading, wood, so so plant growth here and there, so so CO2, the pearling is likely due to respoiration by bactera, that normally consumed the O2, reducing the O2 in the tank.

Water changes = more CO2/less organic loading.

More organic loading: more bacterial consumption of the organic matter=> less O2levels in the tank= more murky looking water.

Large water changes and more CO2 ought to correct and improve things for you.
You can also try purigen or AC.
Regards,
Tom Barr