Welcome to ILGM forum. This is a great place to get advise on growing. Look at the “Bud Of The Month” entries to see the success there is here growing.
2x2 is generally considered the size you would allow for one plant.
What is the height of the space and the size fans are you using in the 2x2 space? I ventilate my 2x4x5 ft tent with a 4" in line fan and have had no problems with heat with a bigger LED.
I would use a 3 gal pot (I prefer fabric pots, they work great) and let your plant maximize it’s yield. If you have too many plants, the yield will likely be the same because they will be crowding each other for light and even with another light they will block each other. Put in one plant and let it stretch is my motto and it has been keeping me happy. You can see nicer buds at the end also.
Just my observations. Hope it helps. Have a great grow. I’ll be around if you have any questions. Jerry