Pics are from day 19, which is the day I topped all the plants. Topped them for a second time a little early - should have waited a couple of days for the new growth. No real damage done though and a lesson learned.
Topped to the 3rd node, stripping everything below, and topped each "stork" at the next node creating 4 main branches per plant.
Seen a little cal deficiency, but increasing the feed concentration to 2.5ml p/l of each will nutrient type sort that out in the coming week.
Will be transplanting to 5 gallon pots in the coming week, once the plants have bounced back from the heavy mainlining techniques they've just been through.