Toasty hit the nail on the head as usual. Some of the smoke you've been buying is undoubtedly quality genetics. If it seemed of lower quality when it got to you, it is more than likely from an unattentive grower looking to make a quick buck not because there is anything wrong with the strain. I grew for years before I ever paid for seed. I was more than satisfied with the results because I did what the original grower did not - provided the best environment possible, harvested at the peak of maturity, and dried and cured the plant properly. Good luck and have fun.