I'm a little reticent to post since I've muddled my words pretty bad recently, but I don't understand Bill's question. Are you essentially trying to figure out if Delta-X reconciles the triangles on the speed point side such that certain characteristics to the right "line up", when the ISO criteria are met?
I just figure I'm holding a rattlesnake near its head and tail. The head can't wiggle that much. It's hard for me to predict where its teeth are, but I sure want to know.