It's 10 PM, do you know where your spring helpers are?

[Ldub]

If you're not using your spring helpers all the time you will have a noisy ride by virtue of the direct contact between the shocks and springs to the body and frame, there would simply be no insulation factor without the spring helpers.

...the rest of the points you've made up until now are at least debatable, with a great many sticking points attributable to possible discrepancies in nomenclature.

But there is no "direct contact" between the springs/shocks & the frame, there are rubber spring isolators between the springs & frame, & every shock absorber I've ever seen has bushings in both ends.

But if what you've done is working for you...