69' stopping problem

[3watley]

I have a 69' C10 with power drum brakes. Just replaced the master cylinder, brake booster all 4 wheel cylinders and rear shoes. The truck will stop fine if you're going slow. If you're driving down the road and press the brakes it will begin to slow but the pedal feels like it stops and seem like it only engages the shoes so far and if you press harder on the pedal it doesnt change anything. Ive adjusted all the shoes and bled lines over and over. The master cylinder/booster setup is from restoration performance. I did realize after installing the master cylinder that the larger resevoir was going to my rear brakes and the smaller to my front. I plan to swap that back first chance I get but would that cause my problem? Thanks in advance