Some comments, nice to see the tank well trimmed, that never last and you have to trim again.
The repeated frequent trimmings can weigh a tank and some species down more than others which seem to like trimming.
If you can avoid trimming as frequently some sensitive species, this can help a lot.
Some plants are better topped, while others are better off pulled up and replant only the tops.
Adding more GH booster(Ca/K+/Mg) seems to help
Traces help
PO4 as well.
With less lighting, you can aviod frequent trimmings and the rates of the plant growth as they fill in after the trim is much more even and consistent.
The post water change coloration: what happens when you do a water change?
What likely is added a great deal?
CO2 mostly, perhaps some GH from the tap, or PO4?
You can also try doing 2x a week water changes to get the tank in good shape for a picture shoot, or a contest. Clean filters, and glass often, water change 2-3x a week for the last few days.
This might be a bit much work though for many people.