Really nice looking!! IMHO, you’re very close, like a week or so, once the buds stop swelling and the last pistils are shriveled. It’s done! check the trichs for amber, then it’s up to you how much you want,
With autos the longer light period means more growth, and since autos are not affected by photoperiod you can flower them at 18/6 and you'll get better growth and yield than if you run them 12/12.
How things have changed, in the late 70's Humboldt growers were getting up to 5K/Lb for great quality sinsemilla ($60 for an eighth), now they're getting maybe 1.5-2K if they're lucky and the weed is exceptional.
Sounds like one plant tolerated the move, and the other got very stressed. No way to tell the outcome. But buds do swell for a couple weeks after the pistils have shriveled back to the calyxes.
Often times it's genetic, a phenotype. It can also, rarely, be caused by a deficiency, BUT, if the plant is otherwise healthy then that's not an issue.
Like anything used, there is some risk, but you can get good deals too. If buying lights, make sure you run them for several minutes to make sure there’s no issues after they warm up. Tents are a good deal, make sure the zippers work.
As long as the "nanners" formed in late flower and were not terribly abundant, it's fine. In late flower plants will often "rodelize" (produce nanners), it's the plant's last ditch effort to pass it's genes to the next generation. If the nanners occur early in flower, are abundant, or there's...
The yellow leaves are basically “worn out” or the plant is drawing resources from the leaves. In any case, they don’t provide much energy in the way of photosynthesis.