your plant looks lush (plenty of N). Internodes are tight. New leaves show hint of interveinal chlorosis and a little twist, possibly. (last 2 = possible elevated P). K looks fine as in no symptoms that i see. If anything i'd say you should dial back a hair on P, if you can. You started fertilizing recently. the soil may have more to give. Easy to adjust to this suggestion if you see anything negative. always easier to add later than try to take away.
I think all of that stuff looks relatively okay. Maybe a little diluted feed nex ttime(s).
So, if you want a little more internodal spacing, raise light an inch or two. Too much light will impede growth and you definitely have some tight nodes. I normally wouldn't recommend this, but remove a leaf or 2. be selective. find 3-4 that face the middle and remove 1-2. don't remove all leaves from any 1 node unless buried and nothing there is part of your future harvest.
that leaf looks like an isolated issue. Maybe due to congestion some moisture was there due to another leaf on it and some microbe persisted for a temporary time etc etc.. if it gets worse and spreads to another leaf, then you know that's not the case, but i'd wait and see on that regardless.