I'm barely feeding... Like half an algae wafer twice a week.
I could always add another liter of water to the liter I have and add 16 more tablespoons of potassium nitrate and four more tablespoons of potassium sulfate... Which would give me two liters of solution with 32 tbsp nitrate, 2 tbsp phosphate and 8 tbsp potassium...
Which would last me the rest of my life if I use 2.5 ml per day. Or I could pour it all out and just use dry ferts and stick to the e.I, dosing regimen and not try do change anything to make it easier for me. It seems like every time I try to make things easier by altering the directions, it gets a lot harder. I just hate knowing that I wasted that much potassium nitrate with this failure in making solution for fertilizing. I'll try to think of this as a learning opportunity and not a failure....lol. It's frustrating.
Back up and look at the 2 other factors here and think about how a plant grows, what causes a bottle neck etc.
Light is where growth starts right?
This causes NADPH and ATP production.
This is now used to fix CO2.
So light drives => CO2 demand.
More light= more CO2.
More CO2= more efficient light utilization also.
So plants can live with even less light using CO2 enrichment than without.
Now the plant has fixed CO2, it needs some nutrients to make other side chains from these carbon "skeletons' or frame work.
So CO2 demand drives further nutrient uptake and demand.
So we have light=> CO2 => nutrients = growth
If we want to slow growth, less light is the obvious starting point.
then we have less CO2 demand and it becomes much easier to mange and much more wiggle room dosing that.
Once you get to nutrients.........now things are extremely easy and highly variable since demand is low. If you still want more faster growth than this, well......add more light and add more CO2 and add more nutrients.
Algae is not CO2 limited nor nutrient limited in any aquarium relative to any plant. So the only limiting factor algae is really light somewhat.
The dog should wag the tail, not the other way around, look at this holistically and do not get caught in the micromanagement trap.
See where the root of the issue is and go from there.
Most all of my own personal tanks are low light, good flow, stocked very well, well feed, breeding and plenty of plant sales, good CO2 and dosed fairly richly. I also have ADA AS in some tanks so that's another source of ferts as well as the water column. To clean off the GSA, use a credit card, it will come off very easily, then do good water changes, dose(liquid or dry, will not matter, whatever is easier for you) and focus more on CO2 and using less light.
You need no more than a 24" w T5 over this tank to grow any plant.
I use 4x24W over a 60 Gallon tank and it's about 14" above the tank:
1.5W a gal of t5 from over 32" to the tops of the foreground plants.