Which is exactly what I was saying....
Also to clarify I spend alot of time on action for playability, I prefer relatively low action (1.7-2.0mm at the 12th). Taking D std well have very much seemed to be a bass-to-bass thing so I don't know how you have 40 basses that all do the same thing. I've never had multiple basses that all respond the same way to strings, setup and playing technique. That seems less probable than what I'm saying but congrats. I also talked about technique and sonically what makes playability better or worse. I can't speak for you or what you do, but this is my experience.
Of course my 40+ don't all do the same thing, that wouldn't make much sense as I could do it with just one. They all have different sounds, different ways of playing them, which is exactly what I want. The uniqueness is what makes the difference, even between two of the same basses (of which I have more than one pair).