Hey lonestand, thought I would pop in and see how you are doing. I see you've got all the experimenting done with and your growing skunk. Good choice, easy to grow and a producer. Those are some cold temps you are working with, My room gets to the low 40"s at night in the winter, just in case the electric bill is gettin up there thought I'd let you know I run a little cooler and see no ill effects.
Ya know, If you were to grow SCROG style and kept an even canopy not only would you get more light to the buds giving you a better yield but in a shorter area you may be able to enclose it and retain some heat. warming the root zone is a good idea too. I used the heat from a light rope under the roots.
Anyway, good luck man.