Hmmmm, I've just thought of a business opportunity...…..
Marketing marketing smokin - you need to give your system a clever nifty name to suggest that you have been visited by the cycling angel one dark night and granted a special special insight not available to mere mortals.
Then, when you have too much business you can franchise your (insert nifty name) system.
My take - anything justified for TDF folk.
Beginners could maybe help with some advice.
Anyone else you can figure it out from being in touch with your body and having existing bikes to measure against.
If needs be (and I know they are considered ugly by some folk but no matter) use an adjustable stem for a while.
I mistrust anything involving advanced maths in this area.
And if it employs a plumb line, forget it.
I had a bike fit (refundable) as part of a bike purchase and after using said bike a while went back to my own sense/ideas/feeling, and now all much better.
To OP - have you considered new socks?