Make sure the mount is correct and the coil sprigs and flat spring is orientated correctly.
It is true some repro springs are too stiff
The brass bushing was eliminated in '29, so unless you have a point car I would use the flat washer as per the service bulletins.
Check out the front engine mount in the service bulletins for good visuals.
It is true that the repro yoke is a little thicker. I've serviced cars with them and haven't had an issue with the pulleys that have been on them yet
It is true that the pulley clearance is close. There are issues as Brent and others have said that can cause the pulley to be closer than normal .. Slinger missing, bad replacement pulley, etc .
You might post a photo on the forum for a visual of what you have
Larry Shepard