@Autotron, back with a little more info. that may help. There's the question of, will leaving the plant at 12/12 reduce yield? Compared to a full-on auto, probably, a bit. But growers have been doing this with photoperiod plants since Jazz & the Blues were in their infancy, so you can deal with it. And there's things you can do to offset any nominal decrease in yields from the shortened light period.
I know you said you were trying to stay with one COB for the rest of this grow. However, considering the bulk your girl has put on in veg / stretch, a second COB and some serious LST training could come close to doubling the yield on your girl. But the way your girl has stacked her branches, it's going to take a lot of LST to minimize popcorn buds at the bottom of the branches, and for her to live up to her true potential. I would only recommend this if you have a second COB. LST will REALLY open her up, and come close to doubling the canopy of your plant. And with this you'll about double the number of top colas she will grow for you.
The only challenge in doing this with your setup is going to be nute changes, because once this style of LST is set it's a PITA to remove the net pot from your DWC container. To work around this set a siphon hose through the top of your net pot to the bottom of your DWC container & terminate the other end of the siphon hose with a cutoff valve ($2.50 at any hydro shop). Or you can install a sight tube in the side of the DWC container with a couple of grommets, two elbow connectors, and a length of hydro hose. This gives you a very handy nute level sight tube as well as drain. Come nute change time disconnect the sight tube from the top connector, turn the bottom elbow 90 degrees to horizontal & catch your nutes as the DWC drains.
If you want to go for the LST training -
what you'll need to do is to run a string all the way around the plant, all limbs, somewhere between 1/3 to 1/2 the way up the plant. Snug this up like a belt and tie it off - the result should be to slightly squeeze the branches inward. Not a lot - what you're really doing is setting an anchor point all the way around the plant so that you can bend over the outer portion of every branch anywhere from 60 to 90 degrees.
Next, take another piece of heavy string (parachute cord is perfect for this piece), tie it to one corner post of your tent, then wrap it around each of the four corner posts, securing it to itself past the starting post.
The purpose of this cord is to create convenient perimeter anchor points all the way around the tent to tie off your LST's with a minimum of work.
This cord should be at about the same height as the "belt" you put around your plant, perhaps a little bit lower.
For the actual LST, start with the top branch, then the most dominant secondaries, and finally the lowest / least dominant lower branches. For each branch, form a loop in a string and secure it about 2/3 to 3/4 of the way up the branch. Drop the other end of the LST line over the perimeter anchor cord, pull until you get about a 45 degree bend in the branch, and secure it to the perimeter cord.
Repeat for all the branches.
I really like using small binder clips (some call them butterfly clips but the box says binder clips) to secure the LST strings to the perimeter cord. They hold securely, are easy to reposition, and can be re-tightened every day or two until you get a good even canopy with every branch. Which is the final point of LST - set them all on day 1 of LST, but spread the bending over several days so as not to crimp the branches. No harm if you do - splint the crimp with a popsicle stick and gauze and start over. She will heal with no harm.
All in all your girl looks happy and you've handled everything that's come at you - great job!!! Since she's stopped stretch, I'd give her a few more days and raise the KoolBloom. Then keep pushing her through the additional bloom stages
per previous formula discussions.
I'd like to share a pic of my girl, but my photo hosting site is down (again 
) so I can't upload any pic's at this time. If the weather's bad tomorrow & I can't go fishing I'll drop one in for your perusal. If I'm counting correctly she's going to have at least 35 nice top colas. And if they fill in like I'm hoping she's going to be a monster yielder.
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