drum brake proportioning valve

It is not the wrong one. Power and manual drum brakes used the same one. It is the disc brake master that is deferent. I used the same master as you, only a deferent manufacture (looks identical). The pedal pressure seems the same as it was with the single cylinder. It takes a lot of force on the pedal with ether in my car to stop it. But every manual brake car I have owned seemed that way. I guess I am just to accustomed to mushy power brakes on these new cars LOL