That part is easy. If their poops are getting too dry, feed a higher percentage of bone. If they are getting too wet, feed a higher percent of organ. The ten percents are a handy starting ball park, nothing close to an exact science. And it is over time, not each meal. According to hundreds of people on the yahoo group I joined when I started doing it, many did well on an organ heavy meal once a week, many did better twice a week, some had different patterns. Bonier vs less boney was similar.
You really don't want to measure exactly, anyway, because it is best to feed the boney pieces intact; not bone by itself. If you need more bone - feed more wings or ribs or bonier fish or take some of the meat off such pieces before feeding them. How it looks depends on how big your dog (or cat) is and what your options are.
For anyone new to it, there are a very few other quirks - heart is muscle so is not organ, weight-bearing bones of large animals are not suitable (large animal being heavier than a young calf; as a rule of thumb, and the smaller the bone, the more important it is to feed it enclosed in the meat.
At the time, I thought it was by far the best diet. I still think so but have mellowed a lot.... the above is intended as fyi, not as