Thank you for this very informative and useful advice. I will reconsider my rack and delve into it a bit more.
Lugia's rack looks very good and makes sense, unfortunately I understood only half of what you wrote as I am new to modular.
Would you rather buy something Lugia's rack or go for the complete set and live with its limitations for a while?
I know that at some stage I would change modules in the Black System III for example as it seems rather directed at those who want to have traditional substractive synthesis. I am missing ways for experimentation, unknown chaotic sounds, generative weirdness... please correct me if am wrong!