I'm too new to actually offer advice, but I can tell you that when I transplanted my clones (in rockwool with legs barely showing) into Miracle-Gro 3-month soil, and under a single 26w 5500k CFL each, they took right off and were obviously growing by the next day. I water my freshly transplanted clones a few tablespoons of pure water daily for their first three days or so in soil, as their roots are tiny and can quickly dry out. Then I gradually stretch that out to every other day, then every 3rd day, and so on. I am new to growing medijuana, but I have decades of gardening experience.

Take a look at them in the sunroom link in my sig...lots of pics, and no signs of stretching or other issues. You setup is a bit different to mine, but I would be happy to start clones/cuttings under your stated conditions.

Here's the link: Sunroom Grow Log