Pretty well too late already.
Remember, ALL of the plants energy to exist is made by/in the leaves, nothing is made in the roots.
Considering that you have already gone pretty hard on the defoliation, removing even more living material would further reduce your plants ability to make "magic grow energy", limiting your plants flowering potential compared to what it already is.
Unfortunately, plants can not "channel" energy, all energy produced gets distributed evenly throughout the entire plant.