First Grow - Triple Automatic: Purple Haze, Apple Fritter, Purple CousKush

Going good so far. Purple Haze (top middle) and Purple CousKush (bottom right) have developed great as far as I can tell. Their stem is a bit thicker and the leafs quite packed, not sure if that is good or if I should raise the light a bit. The Apple Fritter (bottom left) is a bit behind, only one with a thinner stem. Could it be because I treated them rather early in seedling stage with Neem Oil? The Apple Fritter was the first one I watered with the Neem Oil water, so it could have gotten the most, but that's only a wild guess. Could be simply genetics aswell, although I though a "modern" strain like Apple Fritter would outperform the others, but what do I know?!? Still haven't watered them after the initial one (1st of May with Neem Oil) after planting them in the big pots. Substrate still seems slightly damp an inch under surface (finger test) and the pots are still heavy. The Neem Oil seemed to do the trick with the gnats, feels like there aren't any new ones, haven't seen one in 2-3 days-