3/1.5/4 is perfectly normal veg nute though a little weak, as you may know already. Is that the pure blend pro? The liquid Karma seemed to be more hormones and stuff from the other thread on it. It looked good to me. Basically, it seemed to be about helping the plant use the nutes, it didin't seem to be a nute itself

If I was you though, I'd adress the real probs, which is what KP was touching on, I think.
Better lights, and I'd probably repot in a bigger pot too, and get the stem a little deeper down maybe.