My plant has responded very well to the lower nutrient concentration. I've been giving it a little foliar boost - H2O, H2O2, Epsom Salts, Apple Cider Vinegar, and some pH down for potassium.

The plant is nice and bushy, no stretching. The CFL is just a few inches above the canopy. (One day the clamp slipped and the CFL was resting on some of the leaves for a few hours... They weren't happy, but have recovered nicely.)

On foliar sprays... I've been doing some research, and read that although the stomata (pores used for respiration) are indeed on the undersides of the leaves, when you hit them with liquids, they actually close up! (Not buying this? Pluck a piece of a leaf, put it under a microscope, and check it out for yourself.)This counter most accepted info that foliar sprays should be applied to the undersides of leaves. So for good measure, it seems worthwhile to spray the entire leaf.

Also, research indicates that you should aim for a pH of 5.0 for foliar sprays. So add a touch of pH down, unless your potassium is already to high... Then you may wish to add vinegar instead - but not Apple Cider Vinegar, because this is also high in potassium!