this is your problem. Grow the plant properly and you will get proper results with a photo strain.I grow 12/12 from seed.
I had the same problem when I put in 3 months of 18/6 with an MH, small nugs that were kind of dense put way too small to make the expense worth it.
12/12 from seed outdoors would make nice buds but not indoors.....12/12 From seed will not allow you to go where you want. If your space is too small or your not patient enough to veg fix it.
....and for plants that only grow for about 12 weeks they pretty much have to veg and flower without any distractions. its not hard you just have to pay attention.Pictures speak a thousand words. My 1st grow I had two bag seeds. Buds turned out dense but just really small. Like my biggest single mug after dry and cure was like 2.5 grams. Now on my 2nd grow I am at week 4 flower and my buds are already double size from my first grow. The difference for me has been, genetics, I got some good beans with the genetics for yielding lots of big buds. I increased veg time by a couple weeks. And finally and probably most importantly, my plants are healthy and have grown vigorously all throughout the grow. My first grow, I had a major nitrogen deficiency in early flower that was not fixable. Plants finished but yield suffered, I didn't experience the "bulking up" that the buds do throughout flower and near the end.
My bulb is less than a year old, I grow in hydroton using a waterfarm and I stick to the general hydroponics feeding chart ratio, I try to keep it at the highest ppm it can tolerate and keep the ph at 6.0.
I have floramicro floragrow and florabloom.
Haha, I used the flora series on my first grow too. And I recently did some reading up and watched a great video on cannabis nutes and how sooo many of these company's are making products that are not really ideal for canna. Maybe try the Lucas formula with the general hydro products. Remember GH is general hydro, they make a product that will grow a huge range of hydro vegetables. It is not tailored specifically for canna.