Dear Beltempo,
no i didn´t test-drive it in advance, but have been in close touch with "the-ones-in-the-knowing"

Besides that the asymetric leaf springs (also from Suplex) that i had fitted previously haven´t just risen to what they were promised to (not the fault of the idea itself, but my very set - which wasn´t ok) - so either replacing the leaf springs or just switch to the solution my car was intended to have from the start (but not available then yet) wasn´t a long guess for me.
After having played around with several set-ups in different cars by now i´m pretty sure that this will be "it" - for me at least.