Well we dont use gallon it a little bit hard!so your saying that your using 3-4 teaspoons per gallon? Should be enough if that's how your measuring it
I read on internet that a teaspoon is about 4,9 ml you use 3 - 4 teaspoons for gallon (1 gallon = 3,7 liter)
We use 4 ml (so about 1 teaspoon) in 1 liter.. i think 4ml / liters is the same to say 3 - 4 teaspoons for gallon
edit: We use 3 teaspoons for gallon.
In our opinion, if we use more nutriments ph could be lower and some feeding wont be "eaten" by the plant N and C in this case. The c is stored in the old leaf and not in the new so it possibile there is less C ?
The main problem is: is possibile to you understand the time of flowering ? if we are "arrived" we can harvest....