Hey man if it works for you then great but I believe you are definitely wasting nutes. My goal is to never have my tips burn but it happens because shit gets out of balance as she drinks. But I'm not talking in theory, I am talking based on my actual experience.
Would most certainly say get an RO filter. How is your salt build up? My tap water is around 300 which is why I stopped using it years ago. 1 I don't want to smoke what they put in our tap water and 2 I got way more out of my bottled nutrients by starting with water in the 0-10 ppm range.
But all of this is about doing what works for your situation. I just think your bottles would last you longer with the same or better results if you dial it back some.
But there are too many posters that feed at 700 or less in this forum that post their work that in my view disproves your claim about "reaching full potential".
Like you said, whatever works for you, and that is what it is all about.
All that I know is that my bud doesn't burn running at my levels, and I get good product, so I am happy.
Oh, have you ever done a runoff test on a soil grow?
I don't think so, because it is usually in the 1500's at least,
What does that tell you? It tells me that the plant has the capability to thrive at high EC/PPM.
So, I try to emulate soil levels in hydro, and it seems to have worked so far.
Peace