So far, you can probably guess my conclusion:
If you aim to follow the treatises you shall not give a letteral interpretation but a practical one, and admit that equal feeling, equal tension, and scaled tension, had the same meaning: the aim is always playing on an even instrument.
But if we cannot trust pure math, what we can do?
Finding our perfect gauges, perfect for our instrument, our fingers and our preferred brand or kind of strings, it is a matter of just a few empirical tests.
..and, just in case you missed it, here is my post about how to do it:
Here are some more resources. I highly recommend the articles by Daniel Larson because he keeps it very simple