As my first season gets closer to its end, the answer to my question is in the yard. Early in the season the plants grew slowly. As the summer progressed and the sun got higher they got more hours per day of nice strong sun, and they grew fast and full. As fall is here and the sun is dipping down in the southern sky again, in addition to shorter days in general, trees are blocking more light each day and the effects are showing.
The ones that are getting more light are maturing nicely and producing decent buds. The ones closer to the edge of the property that are more effected by the angle of the sun and perimeter trees blocking light, are turning into huge (relatively, about 6' x 6') bushes of popcorn buds. They are maturing more slowly and have fewer and smaller buds than the ones getting more light late in the season.
Since they are all different strains its possible that these are strain specific characteristics, but since I have clones of them growing indoors and they are maturing consistently to each other, that points to the light differences. So that's one lesson learned from my first outdoor grow.