I am liking this journal and wanting to give some FastBuds strains a try. As I was reading through it sounds like you are having trouble with RH being low. What about downsizing your intake and exhaust fans to 4" to help slow the air down, especially with LED's not as much exchange is needed, unless you have heat issues? I just use a 4" exhaust fan and a passive intake on a slightly smaller (3'x3'x6') tent and I can steadily hold where I want to be, though my ambient RH sounds like it must be a bit higher than yours. Anyway, just an observation.