Brake bias?

1967 Dart , power booster(new), KH 4 piston front disc brakes with 9" rear drums, no rear proportioning or hold off valve. The problem is it feels like the rear drums aren't really doing anything when it comes to stopping-I know 9" drums are the best but you should feel some braking. I've adjusted the rear shoes so they were lightly touching the drums and backed them off a couple of notches which made no difference, There is about an inch of pedal travel before anything happens then it feels like the fronts are doing all the work.
The pushrod from the booster to m/c clearance is set correctly( used the gauge from the master power brake service kit to verify adjustment), Raybestos disc/drum master cylinder is new, all new lines,flex hoses, wheels cylinders and springs. Rear shoes and drum are not glazed. Line pressure to the front disc brakes is 1100 psi, rear drums are 600 psi.
What am I missing here or this is normal??
Don