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Just add a tiny bit more fertiliser than what you've been doing if you want to stay in that pot. Sonn you'll have to increase that again,since the soil has got nothing left to give.
I'd ultimately go one or two sizes bigger with the pots..if you need to controll the height, just top the plants and they will become bushier rather than tall
It looks good, but it is really gonna be a challenge to keep it the small pot with water and fertilizer. If you don't plane on moving it I suggest popping it in the ground. If your only concerned with height you can pinch the tops several times and tie in down as it grows, spreading the tops out wide .The best way to grow small photoperiod plants outside is to start them late
I can confirm - u planted to early for this "idea" u had.
Transplant to bigger pot (as bis as u can)
Wait for plants to acclimatize.
The top them. Radically. (sounds evil, do it anyway.)
Basically cut the down by 40% in height, and 20% on the lower branches.
They will regenerate quickly and go bushy.
Your only chance to get moderate sized plants.
By that i mean 130-170cm.
Get a 20 gal fab pot,(mine are only 16 inch high but about 25 inch round ) wire them low, prune when needed, branchey and low, thank me later.
Very Nice plant btw.
Focus on LST Cropping the plant and trimming branches (as they grow). You'll understand how vigorous the genetics are & will get more sun spacing that promotes plant growth.