Very nice looking, I am very excited for you. I think # 1 can go to 1/2 strength.
I put mine into flower when they were 12" to 18" inches. I was frustrated with how small some of the plants were when I put them into flower but once I saw the buds growing I knew it would be ok. This plant stretched a bit but not too much. I topped the first seedlings so I could clone them which gave me four bud sites. This caused the plants to droop in 4 directions and cost me flower time and yield because I cloned and put right into flower. From the clones I took cuttings from the bottom branches and vegged a couple of weeks then put into flower. I feel this was a better method as it produced one main cola that was humungous. Very dense and beautiful. The popcorn buds on the lower branches were like normal size of any other strain so that was extra bud as well. Leaving one main cola did pose a problem in that I had to steak it up so it wouldn't break off. I jokingly told Nevil, the creator of this strain, about this problem and he said, "Yea, it's like having too much money." I agree, it's a problem that we can happily deal with!
PS,
Keep a fan on them to make the stock strong for flowering. I found the fan in veg and flower really helped strengthen them.
Keep up with the pics
,
Dawn