There wasnt much to do but becoming more patient.
I lowered the RH to 65% and lights up on 60%.
On the transplant day they were really dry and there were some signs of overwatering (biggest and oldest fan leafs curled down) and also a little nutrient deficiencies (newest, freshest leafs on top nodes tend to curl upwards -- probably nitrogen, I am not sure).
Now in the new pots there is some soil missing on top, unfortunately. So the old soil sticks out of the new soil like 5 cm up.
I watered them with 2L water, 22°C, 6,3ph, 0,3ml Calmag/L, 1ml BioGrow/L (half dosage).
After an hour or so I watered every plant another 700ml, just pure water with ph-down to 6.3.
Now the plants start freshly in week 3. Hopefully they can recover from all this stress today.
They were really dry for a day already but now it should be fine.
I am going to wait a few days for the plant to recover and then top them and do some LST.