Questions/opinions about my planned nutrients

I wanted to find some more opinions on the Foxfarm's Peace of Mind line (click for link) as well as get some questions answered. I already did some googling and whatnot but I had some more specific questions that would be better answered by experience.

Well, my main question was, would I just be able to stick with one of these products throughout most of the season, or would switching (for example, starting with the one higher in N for the growth cycle) be more beneficial? It doesn't seem like they vary too much but I'm new at growing so that's why I'm asking.

Also, I planned on mixing Foxfarm's Original Planting Mix (link) with the soil at my grow site (guerrilla grow) to enhance what nature has given me. Any thoughts on this?

Any advice is greatly appreciated, thanks! Sorry about my noob questions, I just don't want to be making too many mistakes.
 
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