You'll get a million answers. What I can say is that I've used a lot of different brands through tending friends grows and working in the industry. That being said, after all that I still haven't found a nutrient that is better than what GH has been offering for 30+ years. GH Flora Trio. I use the concentrated version FloraNova.
Look on the content label. It'll tell you if it was fortified or not.
When you spray down your plant I hope you are also spraying the leaf bottoms where mites like to lay eggs and hide. I don't like Neem because of its oily film. I like to use a product called
Azamax. It is a derivative of Neem, OMRI certified and is very effective at killing off a plethora of bugs.
Download a light meter app so that you have a clue as to how much light your plants are receiving. If you have an android phone I recommend Tent Buddy. Iphone? Photone. Having this tool will allow you to be able to fine tune the correct amount of light your plant(s) are receiving. If you really want to improve your grow look into Daily Light Integral. It will show you how much light you want to be giving your plant at each stage of its growth.
This chart gives you a rough idea of what your plant wants most when so you can tailor your nutrients to improve the performance of your grow. The only thing I would change is to start increasing Ca and Mg a couple weeks earlier.
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Light, Temperature and Humidity are the 3 factors that will determine the success of your grow. Get them all right and you'll be rewarded with a nice bounty.