A slight droop after watering is perfectly normal GOUCH but you need a ph meter in a bad way. Notice that twisting on the new leaves? That isn't right, looks like ph problems coupled with N toxicity. In that second picture, notice the back fan leaf clawing down and how green the leaves are? That is a sign of too much N. I suggest you hold off on the feed for a week and get something to ph your water with.
I'm gonna start calling you eagle eye there A4. Spot on. Nitro tox in very early stage.
Is this seed from sweet seeds?