Don't think overwatering. This condition is usually expressed with more radical drooping than what I'm seeing. And the leaves will feel limp and flaccid. The discoloration on the sides of the leaves are more reminiscent of a burn of some kind, and yes too much wind can cause a burn. Also, what kind of light are you using and how close are they?
that soil/potting compost your growing looks like it could have done with some perlite or washed grit added for drainage ,with out good drainage in the soil etc the plant could get lot of problems ,,,mac,,
drill extra holes in the sides. flush'm out , put a fan on it, and ice-pick the soil once in a while for oxygen. next time you give it water ,it should be almost bone dry and lower leaves wilting.
So I drilled more holes in bottom of bucket and poked several holes into soil around stem...a bunch of tiny flies came out of soil. I assume they are attracted to the moisture of the soil. Too wet and not drainING enough.
hope it worked 4u. i had the worst yield '18 but my effort was as equal. i know its because the seeds i used were finders So cared little. Anyway here it is feb '19 and hunting for a good cbcSeed pack. goodluck