Thanks, I'm glad you found it useful. See, I don't like to trim the rootball at the same time I'm chopping it and sticking it under 20/4 lights. It's taking quite a beating already. Will the plant still be OK if I don't baby it like that? Sure, probably. It's a pretty tough weed. But I feel that the less stress I subject it to, the quicker and more smoothly she'll transition back to a useful, cloneable veg-stage plant. I'm not trying to force her to veg; I'm trying to help her to veg.
For me, the key is to make sure the medium is thoroughly flushed of high-PK salts from the bloom nutes, and that the plant is already taking up a new high-N nutrient mix and distributing it throughout the plant before I chop off most of the foliage. Once you've stripped her of her leaves, the plant will take longer to take up the new nutrients, because it's just not taking much water out of the medium. That's also why I like to have the medium slightly more dry than normal when I cut her - instead of watering every day (or even twice a day), suddenly she's only getting a new drink every 3 or 4 days. So if there's any kind of nutrient deficiency or imbalance, it's going to take longer and be more difficult to correct.
I want the moisture profile and the nutrient balance of the coco dialed in to the most ideal conditions for vegging before I start vegging her; I don't want to slap her in the face and disrespect her the same day I'm harvesting her. I think of my plants as my friends, and I'm in their lives to help them be the best marijuana plants they can be. I always try to think in terms of what the plant needs to feel better, and what I can do to give it to them. That's my role. Just keeping them as healthy as possible, and not stressing them anymore than I absolutely have to. Revegging is one of those times where I think you get better and quicker results by babying your plants and easing them along, rather than forcing them to adapt.
Oh, and I grow in coco. So I also make sure that in the last two top waterings, I use a fairly healthy dose of both Hygrozyme and Gnatrol. It's very important to keep the roots as healthy and happy as possible, especially in the early stages when they're exposed to more moisture than they're accustomed to, and this is the worst possible time for a gnat infestation. I try to be proactive on both potential issues, because error correction is a little harder until she gets a healthy set of leaves rumbling away on all cylinders.