single-bladed serrated leaf, no big deal. keep eye on total plant, but looks okay otherwise... difficult to comment on color in pics and wide variety of what's possible. you know your feeding habits, so take that into consideration
pH, concentrations and ratios of elements all impact how the plant has access to each. elements will compete with each other in some cases. If all these things are correct, then we can have confidence in what we deduce from leaf symptoms. Most of the time people need to dial back and they merely throw kerosene on a fire.
I read you noticed growth slowed after transplant -- possibly shock, but also it'll concentrate more so on roots while they reach down and hit the bottom before it vigorously grows again. I keep my donors in 1-gal pots filled about half way. They never get taller than 14" or so.. maybe 18" at most.