Day 25 - She is growing like a beast! Watered her yesterday with 2 litres of water with the nutrients listed above. Trained 2 "main growth" tips (first topping) down to let lower 2 side branches to reach up to them. From then onwards it should keep a canopy itself by still topping at each node and some LST when really needed.
Day 28 - Performed another round of topping, thus creating 16 main growth tips. Removed all big fan leaves and left only top-most growth. Super-cropped the 2 top main branches coming out of main stem to help first 2 side branches to catch up in height as using only LST was definitely not working! She is showing a lot of vigour, I am very happy. Watered her again with 2 litres of only water with no nutrients to give her a short break.