Thanks to the wonderful folks here at the forum, I have found a solution to my problems, if anyone is interested, here is the thread 
Now for the update on the AK420 breeding project, as promised, time for the transplant of the 5 most healthy and nice ones, number #3 is discarded, #5 and #7 are still around but I didnt transplant them.
Testing a new soil mix for the final containers, the mix is:
- 20L coco
- 5L perlite
- 5L wormcompost
- 500 Grams inoculated biochar
Watered in with Rhizotonic, Enzyme (both from Canna), BioTechnology Elycitor (contains many Mycorrhizae and other useful elements and microorganisms) and Agrobacterias Auto bacteria (I’m quite sceptical of this product but its was cheap so 
)
Looks like some good sh!t to me
Making an imprint of the small container in the new soil and adding the last layer of pure coco on top.
Sprinkling small amount of IBA rooting powder on the spot where the plant will be placed
A bunch of white and healthy roots, they have enough integrity to keep the block together after just 2 weeks.
The plants in their new containers
Had to do some tetris in the tent to get it all to fit without turning on the lights in the 2nd layer, but here we go:
Have a great weekend everyone and cheers!
eS 