[rotorwrench]

I would have more questions due to the description of your "brake job" not adding much information. Were drums turned? If so, what is the current ID of the braking surfaces. Were reproduction shoes used with modern type linings or were they restored with older type linings? How was the system purged of air after replacing/rebuilding brake cylinders?
These are just a few that may have an affect on how it functions.

Lockheed type brakes do better if the shoes are pre-fit to the drums using a brake arcing machine. If they happen to fit well out of the box, they may still have to move more than usual if the drums have been turned too far. Adjustment procedure for the Lockheed types has to be followed in order to get properly adjusted fit and braking function. All the air has to be purged and that depends a lot on the procedure used to do that.