Transplanted the girls into 3 gallon pots with a 50/50 mix of Happy Frog and Promix. I know you aren't supposed to transplant autos, but oh well. We'll see how it shakes out.
I was a little concerned I was transplanting too early, but the roots seemed pretty well established. I don't think waiting would have made a difference. Gave the soil a good soaking after I transplanted. Will keep an eye on them.
Conditions in the tent are pretty stable as far as temp and humidity. Humidifier and small fan have made a difference. I have to refill the humidifier daily though. Kind of a PITA.
UPDATE: The girls seem to be doing just fine in their new pots. Growing very fast. Haven't added any nutrients yet. Just letting them use up what's in the Happy Frog first.
Good luck with the grow!
As for the RH, you're right, probably have 'too good' air exchange and the fresh air that comes in is relatively dry, although 10% seem a bit low even then. You can put the exhaust on slower speed or connect it through a timer ;)
@bobo420, I'm having a hard time finding the right balance. If I lower the fan speed, temps go up. I put a clip fan in the tent last night to circulate air a bit better and lowered the exhaust fan. We'll see what that does.