Im convinced there is so much bullshit with these companies Right stuff is a joke

Update******
I contacted Doctor Diff, I ordered their 4 wheel disc aluminum master cylinder with 1-1/32” bore size per their recommendation for use with power booster. They said the proportioning valve in 4 wheel disc brake is recommended as a fail safe just in case more pressure happens for some reason during rapid braking. So i will be adding the adjustable to the rear line coming off the master cylinder connecting to rear feed line. Thank you everyone for you input as always.