Hi Eric,
When you have lots of roots in the cup you should consider moving it again to a 1 gal. pot with 50/50 perlite/potting soil. After it adjusts and continues to grow you can start weening it from your humidity-controlled environment. I recently did this with some by taking them out of the plastic box and letting them spend a couple hours at a time in a sunny room inside. When I could tell they could handle that I put them outside in the shade (I'm in Mississippi, and it's pretty warm now). They have been doing well in the shade for 3 days now. This weekend I will move them to a location where they will get just a little filtered morning sun. You get the picture. I will gradually acclimate to more and more sun. However, don't be in a hurry to get them into the sun. I consider the battle mostly won when I can just get them to be stable in the shade.
I'm sure others will have different suggestions. Good luck.
Henry