The wedge can float alot, one shoe can move before the other, but it should be almost the same unless some of the springs are weak, wrong, modified
later in 36 the factory came out with "floaters", much like the flathead ted ones, but no lock nut needed
both rollers and pins can be different size, if you have one oversized roller it could cause shoesto move at different times ---the oversized heads of the pins are for centering the shoes to the drum/axle