Nice build mah man. Very clean work.
The plant is looking good. I can't offer much since I only do hydro but there are many factors that can slow growth which would take a lot of questions on your medium, nute regime, light cycle, water ppm/ph runoff, drainage, watering, environment conditions etc.
Topping/fiming does stress the plant but typically the plant will bounce back quickly which looks like you did that 2 weeks ago. Are the leaves showing any signs of discolor, wilt, tips up/down, curling, canoeing etc? No webs, white specs, holes in leafs etc? Plant looks good from pics. Did you flip to 12/12?