I fear you have not taken into account Penegar's Principle of Congruence. The Dunstall- Radley scale is a binary based system as I'm sure you are aware of.
According to my calculations the Barnstonethwaite Hobble made famous by fell running legend big Ron "Nudger" Nudgington comes up with a score of 311 or 1101011101 in your system.
Sorry to be pedantic about this but I feel you need to be aware of this fact.