Hey man, looking good, I didn't read through the whole thread but the C99 caught my eye. I started growing the female seeds C99 last spring, its a great plant. I watched alot of grows before hand to see what I should expect, and it seems like a pretty stable plant, only a couple phenos. I got a more compact pheno, and a taller pheno. I liked the more compact more, but waited to long to get a good clone, and long story short but I only kept the taller for the time being. I did buy a second pack of seeds I liked it so much, to try to get another of the compact pheno. Anyway I toyed with harvesting some around day 49, and some as late as day 60 and I really think about 55 is ideal specifically for the taller pheno. I know your almost done with the grow now, but I hope this helps a little.
Edit: something I feel is important to mention is that plants don't start to flower the moment they go into 12/12 lighting it takes time. If the plant is pretty mature when you switch it, then it might only take a few days. If the plant is immature it might take a few weeks to start to flower.
What I'm getting at is I would not expect your plants to be done 50-55 days after you switch them to 12/12 light. You should try to figure off of when they began to form pistils and begin to actually flower.
Personally I try to avoid putting a time frame on any of my plants, and I just harvest them when they truely look ready. But when I run a strain for the first time I do try to keep an idea of how long it took as a reference for running the clones.