There is something wrong with your baby, and I can't quite pin it down. The leaves should not be curling up along the edges like they are. It kind of looks like the mild heat stress or nute burn, but it kind of looks like the very begining of MG deficiency too...it's driving me nuts, so I can only imagine how aggitated you must be over it.

I think it must be root bound due tp the plastic still being around the rock wool, but I can't be sure of that. Considering the size of it, you should have a really impressive root system, and should definitely not be able to set that net pot directly on a counter like that. The whole thing is so damned weird, man.

I'm wondering if you don't have a Calcium deficiency.

Young leaves are affected first and become small and distorted or chlorotic with irregular margins, spotting or necrotic areas. Bud development is inhibited, blossom end rot and internal decay may also occur and root may be under developed or die back. Deficiency will cause root tip die-back, leaf tip curl and marginal necrosis and chlorosis primarily in younger leaves. Symptoms: young leaves develop chlorosis and distortion such as crinkling, dwarfing, developing a strap-like shape, shoots stop growing and thicken.