when we did the bed, we just layed the cloth on the table and worked out all the wrinkles and with the palm of out hands pushed the cloth to the edge of the slate then stapled it.
i might be wrong, but i was told not to get simois too tight.
Your explanation of installing the bed cloth sounds like it would result in a very loose slow playing cloth, but maybe I am misunderstanding you.
It seems to me that most people make the mistake of not getting the bed cloth tight enough. Especially the Simmonis HR cloth. It is more difficult to stretch.
Now as far as the rail cloth, I try to get it tight but not so tight that it deforms the rails. I consider that the determining factor for tightness on the rails. As for the bed cloth, I get it as tight as I can, keep in mind though that I am not a pro installer. I defer to Glen and would follow his advice completely.