You must have been adding the pictures as I was posting. Hope the fert dosages you mention in your first post are the amount you are adding total for the week? They look way too high as daily dosages for a tank your size. Ferts wouldn't cause the problem with the moss though.
Ditto, but what the heck?
That's what I'd dose for a 200-300 gallon tank daily.
Those are more a weekly or more rates.
EI is already scaled to the top end of lighting, so there's no need to add "more".
From there, once things are doing well, have no algae etc, then you can reduce the rates back slowly step wise if you chose.
CO2 is still an issue and makes much more of a difference vs any other nutrient dosing routines.
You have poor moss growth, so you also have a CO2 issue.
Fix that, add a horde of shrimp and they will clean it up pretty fast.
Blackout for 3 days will kill off the Rhizo.
You need to focus on the CO2.
Water changes are good also, dose after those.
Consider some Excel till you get the CO2 right