best thing you have done. keep doing it and a lil through flowering. keep that light at recommended on top of the canopy. i run a digital 250 hps 4.5 inches off my canopy and it is suppose to be equivalent 1000 watter. thats why when you see christmas tree plants the cola prevents the whole plant from recieving valuable lumens. then there buds get smaller and smaller as you go down. to answer your question it is low stress training.