Not at all. I don't think that would be bad soil, I would just worry about overloading the soil. I have been searching for quite some time for somebody with soil tests on a mix like yours. Just curious. IMO, and just a hypothesis, but I would assume somebody would have taken soil tests on Supersoil, yet I have not found it.
I used to use stuff like the Rev or Supersoil. Now I am headed in a new direction, however I am still keeping my ears out for a soil test with a mix like yours. Hope that mix kills it for you.