I can tell you what works, first thing I would do is add more light, 3wpg minimum of 2wpg.
your focus should be getting the plants to grow faster, regardless of the nutrient levels in the tank,
Using the ph/kh scale, dial your C02 in to as close to 30 ppm as you can, make sure your nitrates and phosphate levels are in range or even on the high side,
Ignore the 10:1 ratio for now, get the plants to grow is the focus right?
Tom Barr Method, I have tested this method a few times and it will work regardless of popular opinion's
This is what I would do
Add lights to at least 3+ wpg
Dial C02 to 30 ppm
do a 50 to 70% water change.. "every week"...
add enough KN03 to the level of slight excess for your tank volume (160l) 1/2 teaspoon
add enough KH2P04 to the level of slight excess even if its 2 to 4 ppm 1/16th to 1/8th teaspoon
add an excess of micro's the following day/10ml
add KN03 and KH2P04 again same amounts 1/2 teasppon / 1/8th teaspoon(no more than 3x a week)
add micro's/ 10ml (no more than 3x a week)
Be careful and keep a keen eye on the plants, they will show you what is happening.
"If" you have a good amount of light and your C02 is in range, providing you have nutrients, i.e. Macro's and Micro's your plants will grow and the algae will die off.
Unbalanced and absence of nutrients(Light,C02,macro's & micro's) is what makes algae grow.
Try that for a couple of weeks and see if things do not improve.