When you adjusted the brake shoe's at each wheel did push the peddle to center the shoe's and then check for for some friction? Several small adjustments may be needed to get the shoe's close and centered. I agree that you should re-build the master again or have it done and then re-adjust each wheel.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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