You will get much better results with more expensive nutes. Check you Shultz and MG packages, look at what nutes are in them. Plants need 17 elements to survive, how many of those 17 are in the MG? Not many. But the higher end nutes have more of the micro nutes, beneficial bacteria, etc.
Also, soil is very important. I was using Super Soil from Home Depot with some additives, and when I swtiched to Fox Farms Ocean Forest soil, I noticed a huge difference. They make awesome soil, but their nutes are are not the end all be all as you desribed. I used them for about 2yrs and on my next grow I will be switching to Pure Blend Pro. Not because of my results, just because I want to try something new.
There are lots of good nutes out there. GH FloraNova is a good one part. If you are looking for something more complicated, the FF nutes are a little more complicated to mix. And if you want something that is going to cost $500 for the entire lineup, go with AN. But for $30-$100 you can get a good nute line.
NPK is only the beginning with nutes. These are the 3 macro nutes, but micro nutes are just as important. Lacking one nute will cause another to not be absorbed, and too much of something will cause others to not be absorbed.
In my opinion it would be a good idea to switch up your nutes and try a quality soil.
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