I don't know what you've been using, I'm using Plant Tone products. Garden Tone 3-4-4 and Tomato Tone 3-4-6 and Plant Tone 5-3-3 for my nitrogen fix.

I also use Espoma/Plant Tone products--Mostly Plant Tone and Holly Tone, with occasional applications of the others if needed.

I to am using the Espoma brand planttone, bio-tone starter plus, soil acidifier and garden lime, I have been getting great results I noticed that I don`t seem to get fert burn like I did with other ferts, even sea tea diluted by half would cause a bit of burn. For me I like that I can apply to soil and water with a hose I always hate mixing in a gallon jug and lugging it to the plant. They have a nice website just google espoma, I was lucky the big box store started to carry their products. :o)Deanna