Great thread and a really good read packed with nice advice!
I have to say I'm with Blue on the Canna tip , I use Canna coco professional plus with powder feeding, pk 13/14 & Desity CalMag Pro (it also has Aminos Acids and plant sweetners ).
I also add 20% Perlite.
Maybe Canna pro + doesn't work so well with the AN line of nutes?
As a general rule it is good advice not to transplant auots.I totally agree for the most part.
However.........
I grow AF-SOG with specific "stunting" technique (small plants that are virtually all bud.
I Start my auto in 1ltr pots and transplant at sex. (in to 8.5 ltr pots)
What does this do....?
Well it provides transplant shock right at the moment the plant wants to stretch.
This transplant shock(at the desired time) keeps the plant short and stocky (ideal for those with limited head room).
I also keep my light on 24/7 the give a stable and constant temp (I also use a temp controlled fan).
When using a lights on and off set up, you will find there is a drop in temps in the dark period.
The larger the temp swing between lights on and off the more stretch you will get.
This can be avoided by using a cheap tube heater with at thermostatic plug for the dark period.
Having shorter plants means more penetration of light and also keeps the intensity brighter due to minimizing the inverse square law effect.
Buds at the bottom get virtually the same amount of light as the top.
This is not a technique for everyone and maybe should be avoided if your new to growing (unless your looking for a technique for a low height grow cab).
It works a treat though and I get great result with it and coco.
12" plant all bud no gaps.