I am not going to say anything negative about the string matrix, it´s fantastic, but I think for a different reason. I don´t know... Am I the only one that gets some other information out of it, namely that the way of playing is WAY MORE important than the strings? After all, it´s just nuances, especially in the listeners seat. On the player´s ear, the difference is huge, but outside? In general, I think (and I don´t want to dismiss peoples´ hobbies here), too much fuss is made about strings (maybe also about basses), and too little is the actual PLAYER taken into the equation.
I´ve had two experiences myself that led in the same direction. One was: I was doing the same thing Hervé did for myself, with my bass, granted with less different examples, and also with a narrower variety of strings (velvet compas 360, spiro weich, d´addario orchestral, d´addario pizz), but still, and what I heard was basically MY SOUND, and most of what I like and dislike about it was in there. In fact, all of it.
The other was one of my teachers. He had the absolute "dynamite sound" ("thank you bruce, coming from you, bruce, that means a lot", hehehe) on his bass and on sipro e/a and gut d/g. Then he played on numerous student instruments with a huge variety of bass qualities and sting choices. Guess what? Dynamite sound.
So, in a way, the string comparison matrix can really calm you down. Don´t take it too serious playing a jam session bass with some strange strings- chances are people will recognize you anyways. Don´t overestimate what strings can do for you- it´s all in your hands. Don´t waste precious money on ever changing trials: Chances are you´re losing practice time. Instead, stick to what feels right, stop thinking about it, turn your attention to other matters.
And again, the other extreme (some people here seem to have some sort of string obsession thing going) is also totally fine- for some it´s quite an entertaining pass-time. No offense at all...
Anyways, just my two cents, as always.
Mr Sidecar