That shouldn't be too close but they are reacting to something. That curling and twisting could mean nute burn or zinc deficiency. I would lean toward nute burn. Are you monitoring your PH and do you have a regular feeding schedule? I think the one curling most is the pic I pointed out from your previous post. Might want to give them straight water for a couple waterings and see how they react. I would be tempted to flush if it gets worse at all to get them straightened out fast.
Did you recently transplant?
Cool, you should be just fine. Personally I like to veg for 7-10 days while introducing light flowering nutes so the roots can take off a bit before I start flowering. I would let those roots spread a bit and use up some of the goodies in the soil then introduce your flower feeding at 1/2 strength the first time. Are you totally stoked or what? Stanky buds to come soon!
Probably 2 or 3 pounds.
lol jk idk how tall are they and how big are those current pots?