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With respect, there are only two springs in the entirety of an original '33 passenger car/commercial vehicle brake system. One is the return spring for the pedal and the other on the cross shaft mounted on the center cross member. There were no return springs on the rear brakes. The spring on the cross shaft retracts both the front and rear brake rods equally.
Apart from the fact that the front brakes wear somewhat faster than the rear brakes, one other possible reason for a disparity between the free play between the front and rear brakes could be that your front brake rods were changed at some point in the past and they are now longer than the originals.