Honestly I was mixed up because I had just read about the aerojet, back to back as the original genesis machine, which does use a demand pump, regardless, with those misconceptions out of the way let me give something to help you, first on doing your own stock solution the best way to go about this is to go google hydrobuddy, download it, get familiar with it, though I would take botanicares advice on cutting to half to a fourth of the target formula, for example in hydrobuddy I'd aim for Lucas with 100-100-200-60 NPKM, then I'd chose from the source list, for all of those, adding whatever additional you wish, though I just use kelp as a solution x for all the micronutrients.
Ok then back to the HPA, I assume you guys have been to mist cooling, google it, they have sprayers in various metals, all in the aperture sizes you are apparently looking for, they have extreme high pressure line capable of taking 1000 PSI, it seems to me that they have resources for a lot of the issues various people on the thread are describing.
Lastly I don't know who is aware so I'll make the others aware, the main ingredient in nutrient leeching solutions is citrate, you can buy it yourself far cheaper and use it in your reservoir to prevent precipitation of your nutrient solutions.