Whoa now ! Don't go dismissing AN outright....
Not sure why all the haters (aside from the marketing hype) but it works.
I got into trouble by pushing the max nutrients amounts but backed off in time. Half the recommended amounts and staying close to a 1/1/1 ratio seems to be the ticket for me.
The M/G/B (3x1L) and three supplements (3x250ml) cost me ~$140. So not THAT expensive.
From three plants (two grows) I got +30 oz and still have enough nutrient left to grow ~ two more plants.
Using ProMix HP, two gallon plastic pot for one plant (13.2 oz), three gallon fabric bags for the other two (17 oz), 600w MH/HPS, roughly a 3' x 3' enclosure and well water with a ppm of 500.
Having said that, mixing up solutions every day can become a PITA
Just out of curiosity I want to try MegaCrop one part on my next grow. That cost me about the same but will last for years !
Any pics of your 3/4 pound plant in the 2 gallon?