Adjusted mine on my KR and it made a big difference in my shifting, especially in the lower gears. As for the "Parallelogram" theory, for us none mathematical types, you might follow the train of thought of adjusting it to the point where you have to "go get" the shifter. Basically, adjust it to the point where you have to extend your foot down to get under the shifter. That way, when you straighten your foot out to it's natural position, basically 90 degrees, you will be at the top end of the shift. That way your not straining to shift up. It worked for me.