So a full canopy is no bueno when growing indoors? I am confused. I realize that most of the lower stuff will be larf thus why i have been slowly removing undergrowth alittle bit each day since the final week of veg not to stress the plant and also to divert energy to the tops. I could be wrong in my experience fuller canopy's yield much better for me over all. I go by the rule of thumb when harvesting and any buds smaller than my thumb nail gets tossed in the hash pile regardless of density
I'm just saying at the 2 and 3 week mark you should remove any secondary branches below 18 inches so the plant is not sending nutrients to make fluff. Always an hour or so after watering and dont remove fan leaves. Just remove any bud sites that are growing on thin stems, thinner stems means that branch isn't getting much light and will flop over from the weight of fluff.
I have packed canopies several times and found that I don't get trim worthy bud past 18 inches deep.
Ideally you would want the plants to be only 2-3 feet tall from soil because leaves below that will recieve more far red light (telling the plant that it needs to stretch to get the good red and blue light). In nature, shade tells a leaf to stretch it's branches and enough shade will tell the plant to draw nutes from that leaf for growth in a more exposed to sunlight area.