So you have a strong enough light then from the sound of it. Again, all ican go by is the way the plants look, and they look pretty much as healthy as can be, and if you have that kind of light over it, it'll do what it can. Be patient, once flowering slows down in about 2 weeks, they go through a short 'fattening' phase as well just before harvest. Don't compare your plants to someone else's..even if same strain, not all seeds come out the exact same way as another. I had 3 moneymaker plants last grow..all in same exact mixture, under same light, one got me just shy of 3 oz's..the one right next to it got me only 1.5 lol. As long as plants are healthy, and the end product is good, you did all you could.