im having pretty much the same issue on a grander scale, my entire uv in nifskope is litterally and f*#@ed up spider web, apparantly its somthing to do with the nifskope version or somthing
there is a mod that does this its sneak tools, it adds working rope arrows that allow you to physically pull your self up a rope, the the best thing in skyrim for climbing atm, while buggy you can accept it