I was under the impression that organic matter was somehow a nemesis, since you stated you only wanted non-organic amendments to your clay (non-organic) soil. You gave no indication that were talking about the soil layer below the rose root zone. If this was supposed to be self explanatory, or you clarified somewhere else that I missed, than I am really stupid, really sorry and really embarrassed. 
It all makes sense, now. Thank you for the clarification.
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