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#1 is growing and spreading out much faster. Can't wait to start flowering, but probably another 2 or 3 weeks before I fill out enough space. I went a bit heavy on the veg nutrients and started to see a bit of yellowing and curling on the tips so I gave them plenty of water.
I watched a video where a guy had 4 plants of different heights. He raised the pots of the 3 smaller plants, each by different amount, to create a level canopy. That might help you if your 4th plant is smaller.
good luck with it all, I'm a noob so cannot offer more than 3rd hand advice and best wishes.