#1 and #2 still going strong. I transplanted them into 3 gallon fabric pots today with a 2:1 ratio of FoxFarm Ocean Forest to Perlite and some Mykos around the roots to promote growth. Added a drop of SUPERthrive to a gallon of water and pH corrected to 6.2 before watering around the rim of each plant in the new soil. The other seedling's didn't make it due to my overwatering. The compost I added was not drying as quick as I assumed it was, and the newest seedling I planted died from damping off. The original #3 is still alive, but it's not really growing much.
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.