In post 34 you show a 33* angle in the brake pedal arm---and stated later that you had 3/4 inch travel in master rod-----thats not a very good mech leverage ratio-looks like maybe a 3 inch arm and a 7-1 would get it out to 21 inches? 5-1 maybe 15? you can raise the pressure by a better leverage/geometry and even a smaller diameter bore master. maybe down to 7/8? there are graphs out there that show the volumes/pressure differances-------