Nitrogen toxicity from feeding too much or too often, or both.
In soil it is a schedule of plain water/plain water/feed/plain water/plain water/feed.........so that your plants are only being fed every 10-14 days, which is plenty in soil, as soil "holds onto" nutrients and the plants need to use up what is already there before new nutrients are added.
At this stage I would be giving just plain water for the next 10-14 days before resuming feeding with half to three quarters the strength of what you are giving now.
I would also advise against doing any further defoiliation, those branches rely on the fan leaves to make the energy they need to grow.
Just remember.....
less leaves = less energy being made = less growth.
Hope this helps, Organoman.