Putting booster on 66 drum brakes driving me crazy

[buildinga55]

Adding a booster to the original drum brake setup. Split the lines and went with a 67 dual reservioir. Also put on new shoes and wheel cylinders. Bench bleed mc and installed. Drilled hole lower on brake pedal as instructed. Left just about a 1/4 play in pedal to prevent pushing on mc. Here is the result. The pedal seems to get very hard about half way down and you can stand on it and it will slow the truck but not like it should. It kind of coasts to a stop i tried moving the pedal rod back to the original spot thinking this feels like the mc is not getting fully pushed in. That just made the pedal feel spongey but did not help the stoping. So I took the booster back off and you can lock the truck up if you don't care to really stand on it. I cannot figure out why my braking is worse with the booster than without. It is my father in laws truck and he needs the power assist. . Any other ideas.