There is no question mark at the end of any of your sentences with 1 X 1.09 in the original OP. I've never heard of that method, nor do I take much stock in any method for fitting that involves crunching numbers. For me it's a visual along with trial and error.

No matter where you measure to or from, you will still have to do minor adjustments. It's how your bodies pieces parts feel that matter, not what a number says.