It is actually a Good thing to start with more plants than will fit the space and then mid vegetative stage or so retire
the overage, choosing the healthiest/strongest, etc.
If you are determined to keep all 10 (?) plants we need to talk a bit about space management, light and air flow !
Let's say your pots are about a foot wide, a good total width goal that you would allow the plant(s) to grow into could be 16 - 18" using a cage or three bamboo poles and a ring of wire that you can restrain and/or tie branches to...
The best use of your lights is to maintain a level canopy. So sorry to say, I would suggest you at least trim those two tall girls to a foot or so high
They will then pretty well develop along with the rest of them until flower. Consider they will at least double in height after you flip to 12/12, no matter how old they are. You control their eventually height by controlling the light on hours.
Is you space light proof ? Must Be!
You could remove them and think of them as a trial and learning experience ! And gain the space and the ability to give your girls All the same amount of light !
Then consider that very shortly your existing plants will FILL that space. Working on them will be a PITA
By trimming/training you could MAKE an upside down Xmas tree in that 18" space !
This gets all the bud sites in what I call the Happy Zone
Gradually over time remove all bud sites And fan leaves from the bottom third of the plant. I like to have this done by no later than a week after you flip the lights to 12/12. By trimming/training branches you can control
how many are going to compose the final Buds. The plant will concentrate all of it's efforts into what you have left to receive the bounty of the sun
You didn't say how many watts from the wall your lights draw ?
The most efficient use of your lights is having a Level Canopy Across the whole space. As is you would be using one light for two plants and the other for eight ? Do you want to raise eight pots or Lower two
Let us take a step back and talk about your expectations on yields ? How much do you Need with enough left over for Gifts
If you have upwards of 32w/ft and allow the plants some room to grow and depending on the strain it would not be unreasonable to expect 4 - 6 oz/plant !
This brings me back around to light again ! Your lights may not have dimming controls so you use height to maintain the optimal amount of light to the canopy.
I have a number of par meters on my phone but the one app I trust the most is a simple (and free) Lux meter. Take a measurement at plant height and convert the lux's to par. Your plants appear to be able to handle 30,000 lux or 450 par. I convert lux to par x .015...
That should be a happy amount of light. Can you keep your temps down below 80 and relative humidity at least 50% ?
More happy parameters
Here is an extreme method to fit max plants in a space. Remove everything below the top slowly up to flowering. That will grow you one Large Cola and fit between the larger plants. And that single cola could be oz's !
Those rust spots could possibly be a call for more magnesium but one spot on one leaf is Not a concern. You have upped your nutrients and added Cal/Mag. Keep an eye out for more spots but for now, give it a week before Even considering a change in feed !
If you are feeding equal amounts of all three you should be good.
And judging by your pictures they look Excellent !
Well done so far, eh ?
Sorry for the ramble, Apple Betty and I are getting ready to go chop some plants up
Cheers
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). But I absolutely appreciate everyone's help. 
