Could be the water, I water outside of the grow area and let them drain for half hour then put them back in. Also I know that when the lights are farther away you get more of the intricate smells/tastes from the oils (from Cannabis Culture article). I noticed recently that the buds that are within 2" of my bulb smell more spicy than the ones a bit farther away which smell more of citrus/skunk...The closer ones are also maturing a lot quicker.