I made it about 1/16" from booster push rod to the center of piston hole on master. I used a tool to get it right but not necessary.
I found this video to explain, it is a corvette site but works.
Just from my experience lately, I have power brakes with discs up front. Could never get good stopping power with 1-1/32 master no matter what. Today put on a 15/16 master and my Demon stops excellent. This made my brakes great again.