I am using mega crop right now and I like it but it needs some additives. I seem to need a bit of mg for my plants and megacrop has very little sulfur so you might want to supplement that as well to bring out the best flavor. I think additives that work great with megacrop are Heavy prime, which has sugars, b vitamins, l amino acids, well needed potassium sulfate, kelp and even some silica.
Sea green is also another great supplement as well. Be careful with pk supplements because although you need one megacrop has a lot of k in it so you do not want to overdo it.