You're still telling me what I more or less already knew, and insisting I didn't know it. One can know things in theory, and still wonder what would happen in practice, perhaps bending the rules. Or maybe you're above that. The experiment was casual at best - RG-58 was what I had on hand, and another type of cable wouldn't have made the experiment 'successful'.
Please don't insult me, I'm well aware of the theory and importance of impedance matching, and have been since I was about 16 years old. This particular case is an extreme one though, and quite possibly you have more experience with Gigohm-range circuits than I've had. There you go, happy now?
Good luck with the project
(BTW, I did not 'forecast doom and gloom' on the project, I just noted that a lot of people posting on it had too-simplistic ideas about how easy it would be to accomplish.)
Dave