No, Iíve been meaning to purchase a PO4 kits. But nobody in my area sells them. I just need to get it online. Chances are itís my light. Iím running the Fluval Planted 3.0 in high for about 6 hours and and extra 2 for the ramp time. Iím hoping to get a CO2 kit by next year.
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In my opinion, without CO2, the first thing you should do is figure out how much light your fixture is providing. I don't happen to know much about LED lights, but maybe someone can chime in and estimate a PAR value for you.
Once you have a better idea of your light levels, it should help drive every other decision you make. And it may turn out that fine tuning ferts might not be your problem at all.
If the PAR is Med/High, and you are dosing ferts, then the plants may be starving for CO2.
In general, high light + high ferts - CO2 = algae farm.
There is also a world of difference between pleasing low light plants and fast growing stems. No mention in your post. Are we talking Anubias/Swords or stems? A picture of your tank and more information will probably help you get better advice.
And in general, I'm sure you are aware that you will have lots more options and everything will change when you add CO2.
Good luck and look forward to seeing where you go from here.