not letting the buds finish all the way is the cause of your buds being fluffy most likely, the last 2 weeks is when the buds really swell up and get denser. he never gave any info on his grow guys, how do you know he used cfls, no c02, cheap nutes? you can get dense buds from cfl grows, c02 isnt a must either, cheap nutes can give you dense buds.(im not saying that they dont help, because thats wrong, they will help quite a bit, your theories are all good) timing is the most important factor imo, we cant say its cuz of his setup if we dont know what it is.(my reply here also kinda falls into that category. lol, he never said when he harvested and if they were completely done.)