What do you water with? Tap water or purified water? Do you allow it to sit to dissipate bad gasses trapped in the water like chlorine? What did the roots look like when you re-potted? Did you "tease" the roots to encourage new development? Every once in a while it may be a good idea to punch the sides of the buckets to encourage loosening of the soil before watering. I recommend watering by dousing the plants medium entirely until you have good run off and then stop. If there are nutes in the MG organic soil are you adding any organic additives like Hygrozime? Sorry for the ball of questions!
I'm partial against MG soils so I kinda suspect the 60% in the mix... But at the same time it does not look like a nutrient problem, your leaves are a good full color.
~gg420
Believe me, I did my research before using MG organic, and it is not the type with nutes in it or any slow release crap.
I water with tap that has sit 24-36 hours.
No I did not do anything to the roots when I re-potted, however this was an issue before re-potting.
For the past two weeks I have used MG tomato 18-18-21 ferts sparingly, however this began before the use of ferts. I have also been using superthrive for the same amount of time.
Like you said, I don't really think it's a nute problem. I am curious though, does this look like a humidity problem? I'm not sure, but I really need a humidity meter. They are growing fine, but this leaf curling problem has got me stumped.
Thanks a lot for the help DubB83!