Finding tobacco blending information is kinda thin . I guess the indusry have well guarded secrets , like where they purchase tobacco , manufacturing processes and recipes.
Seems like it’s quant 17th century technology which really hasn’t changed much . If you were brewing beer or wine or most any home and garden hobbies , you would get all kinds of sources of great information and modernized equipment. So , the take away is , we are the pioneers of homemade pipe comestbles.