5 Strain Grow (GSC/WW/BS/ARC/GOG)

A turbulent and problem-filled week so far. After being filled out with roots in their original container i transplanted them gals into their final 18L pots some days ago. I made a big mistake. Ive grown only in soil before, and before i soaked the medium alltrough with water before transplant with good results. But the vermiculite holds water much much better than soil. With the result that i got drooping plants struggling in pots with to much water not drying out. Lesson learned. So now im just waiting for the pots to dry out and continue with regular feeding schedule. This time around my plan is/was to skip the tents and make the whole small room into my growspace. In theory i think i made a good desision. Fresh air with intake- fan low in one side, exhaust high in other side. But in reality i bumped into a lot of problems that im still struggling with. First of all the air intake. temp outside is to low with RH of just 15-20%. its was a mess. Went away from home 6 hours and the fan was a big blob of solid ice, and tubes covered in ice and snow. ouch. I made that my exhaust instead. And the air out is now my air-intake instead. But the RH in the room is still to low. My humidifier runs 24/7 without solving the issue. So now im drying all the familys laundry in the growroom to try to push RH up. :) My next problem is my temp/hygro sensors/wheaterstation. Yea i know, cheap one from amazon, but they worked without problem earlier in the grow. I also tested them with good results. But now they show 35-40c with the same RH as before i switched the intake. And the plants dont show signs of heat/light stress. It dosent feel to hot with my hands. And my termostat, and the sensor from the fan, plus to other termometers shows temps of 25-27c. And the girls got a gentle breeze. Any ideas why the sensors all of a sudden shows inaccurate results? Anyway. I trust my looks and my other sensors/temps as long as the plants seams fine. In terms of growth and health of the plants i got a clear winner so far. Girl Scout Cookies. They are all far ahead of all the other 4 strains. They are where i suspect they should be right now despite my problems. 5-6 nodes. Healthy. Looking great. Black sugar is 2-3 nodes behind with 1/3-1/6 in size compared to the GSC. Small and slow. AlienRockCandy looks great, but are 1-2 nodes behind GSC and about 1/3 in size compared to GSC. GelatOG is the clear nr 2. Looks good, just behind the GSC. WonderWoman have 1 plant in good size, the rest are like 1/4 in size, and one is mutated. Main branch got "stuck" in second node, and then started to grow horizontaly. It looks nothing like normal development. If the slow progress continues, GSC, and maybe GelatOG, is the only ones im gonna grow again.