i went back and studied the set-up further and understand the "minor modification" your refering to.
i also noticed something else that i will have to adapt/purchase??
i didn't have the link sized right on PC screen and now i realize that your using two MULTIPLE wheeled pulleys!
the set-up i copied from QJ has as you know 3 SINGLE wheel pulleys.
your getting a 3-1 (?), mechanical advantage but i understand that your working against the weight of pack "sagging" top rope.
i'll PLAY with my 3 pulley set-up this winter and see if i can't adapt it as the link described?
if not, it's no big thing to get 2 multiple wheel pulleys.
this post has proven once again that there is alway's room to improve a good thing ;) ;).