Week 5 finally brought some stretch. At the beginning of Week 6, I adjusted the LST and removed some smaller leafs deep down in that forest that started to turn yellow. Furthermore i started to add BioBizz - Top Max to the list of nutritions.
On day 42, I removed some leafs near the bottom (about 25) that already were or have started to turn yellow. Additionally I tried to water 1 day earlier than the times before. Furthermore i adjusted the LST a little bit, in hope for some smaller buds to catch up with the rest.
At the end of the 6th week, the lady still looks great and seems to be focusing on the buds. As it is getting warmer and warmer outside and therefore also in the box, I have also hung up a CO2 bag in the box. I hope it helps her to cope with the high temperatures. Even if I don't know if this really helps, I don't think it should do any harm.