The thing that “makes” an RO system is the membrane. Having filters can remove particulates, and in some cases, improve taste. But by not having a membrane in use, filtering has nothing to do with RO.
BTW - I suggested distilled water because I fear the pH of your well water is too high. If you put your well water through an RO system, it will likely still have high pH.
The difference between a pH of 7.2 and 8 is actually much greater than it appears. A pH of 8 is literally 8 times more alkaline than a pH of 7.2. When it comes to unrooted clones, this is enough to cause serious issues. In fact, even with rooted clones in a hydro environment, a pH of 8 is likely way too high for plants to thrive or even survive.
Back in the days when I lived in a home with municpal water, I grew organically in soil, using Sam’s World soil, Earth Juice products and tap water (followed BOG’s methods!). I NEVER worried about pH. Literally - never once measured it. My plants were always extremely healthy and vigorous. Hell, I was voted “Best New Grower” on the old Overgrow back in 2004 because I had such good luck with my plants. So, believe me, I know tap water, even municipal tap water can be great for plants - if the pH isn’t too high or low.